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  Subjects -> ENGINEERING (Total: 2298 journals)
    - CHEMICAL ENGINEERING (192 journals)
    - CIVIL ENGINEERING (192 journals)
    - ELECTRICAL ENGINEERING (104 journals)
    - ENGINEERING (1209 journals)
    - ENGINEERING MECHANICS AND MATERIALS (385 journals)
    - HYDRAULIC ENGINEERING (55 journals)
    - INDUSTRIAL ENGINEERING (69 journals)
    - MECHANICAL ENGINEERING (92 journals)

CIVIL ENGINEERING (192 journals)                     

Showing 1 - 192 of 192 Journals sorted alphabetically
ACI Structural Journal     Full-text available via subscription   (Followers: 17)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Structilia : Journal for the Physical and Development Sciences     Open Access   (Followers: 2)
Advances in Civil Engineering     Open Access   (Followers: 36)
Advances in Structural Engineering     Full-text available via subscription   (Followers: 28)
Agregat     Open Access  
Ambiente Construído     Open Access   (Followers: 1)
American Journal of Civil Engineering and Architecture     Open Access   (Followers: 31)
Architectural Engineering     Open Access   (Followers: 4)
Archives of Civil and Mechanical Engineering     Full-text available via subscription   (Followers: 1)
Archives of Civil Engineering     Open Access   (Followers: 10)
Archives of Hydro-Engineering and Environmental Mechanics     Open Access   (Followers: 2)
ATBU Journal of Environmental Technology     Open Access   (Followers: 4)
Australian Journal of Structural Engineering     Full-text available via subscription   (Followers: 6)
Baltic Journal of Road and Bridge Engineering     Full-text available via subscription   (Followers: 1)
BER : Building and Construction : Full Survey     Full-text available via subscription   (Followers: 10)
BER : Building Contractors' Survey     Full-text available via subscription   (Followers: 4)
BER : Building Sub-Contractors' Survey     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Building and Construction : An Executive Summary     Full-text available via subscription   (Followers: 4)
Bioinspired Materials     Open Access   (Followers: 5)
Bridge Structures : Assessment, Design and Construction     Hybrid Journal   (Followers: 16)
Building & Management     Open Access  
Building and Environment     Hybrid Journal   (Followers: 15)
Building Women     Full-text available via subscription  
Built Environment Project and Asset Management     Hybrid Journal   (Followers: 15)
Bulletin of Pridniprovsk State Academy of Civil Engineering and Architecture     Open Access   (Followers: 6)
Canadian Journal of Civil Engineering     Hybrid Journal   (Followers: 12)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 8)
Case Studies in Nondestructive Testing and Evaluation     Open Access   (Followers: 11)
Case Studies in Structural Engineering     Open Access   (Followers: 9)
Cement and Concrete Composites     Hybrid Journal   (Followers: 17)
Challenge Journal of Concrete Research Letters     Open Access   (Followers: 2)
Challenge Journal of Structural Mechanics     Open Access   (Followers: 5)
Change Over Time     Full-text available via subscription   (Followers: 2)
Civil and Environmental Engineering     Open Access   (Followers: 7)
Civil And Environmental Engineering Reports     Open Access   (Followers: 6)
Civil and Environmental Research     Open Access   (Followers: 19)
Civil Engineering = Siviele Ingenieurswese     Full-text available via subscription   (Followers: 4)
Civil Engineering and Architecture     Open Access   (Followers: 18)
Civil Engineering and Environmental Systems     Hybrid Journal   (Followers: 3)
Civil Engineering and Technology     Open Access   (Followers: 10)
Civil Engineering Dimension     Open Access   (Followers: 8)
Civil Engineering Infrastructures Journal     Open Access  
Cohesion and Structure     Full-text available via subscription   (Followers: 2)
Composite Structures     Hybrid Journal   (Followers: 270)
Computer-aided Civil and Infrastructure Engineering     Hybrid Journal   (Followers: 11)
Computers & Structures     Hybrid Journal   (Followers: 36)
Concrete Research Letters     Open Access   (Followers: 6)
Construction Economics and Building     Open Access   (Followers: 2)
Construction Engineering     Open Access   (Followers: 9)
Construction Management and Economics     Hybrid Journal   (Followers: 22)
Construction Science     Open Access   (Followers: 4)
Constructive Approximation     Hybrid Journal  
Curved and Layered Structures     Open Access   (Followers: 2)
DFI Journal : The Journal of the Deep Foundations Institute     Hybrid Journal   (Followers: 1)
Earthquake Engineering and Structural Dynamics     Hybrid Journal   (Followers: 17)
Enfoque UTE     Open Access   (Followers: 4)
Engineering Project Organization Journal     Hybrid Journal   (Followers: 7)
Engineering Structures     Hybrid Journal   (Followers: 13)
Engineering Structures and Technologies     Hybrid Journal   (Followers: 2)
Engineering, Construction and Architectural Management     Hybrid Journal   (Followers: 14)
Environmental Geotechnics     Hybrid Journal   (Followers: 5)
European Journal of Environmental and Civil Engineering     Hybrid Journal   (Followers: 9)
Fatigue & Fracture of Engineering Materials and Structures     Hybrid Journal   (Followers: 16)
Frattura ed Integrità Strutturale : Fracture and Structural Integrity     Open Access  
Frontiers in Built Environment     Open Access  
Frontiers of Structural and Civil Engineering     Hybrid Journal   (Followers: 6)
Geomaterials     Open Access   (Followers: 4)
Geosystem Engineering     Hybrid Journal   (Followers: 1)
Geotechnik     Hybrid Journal   (Followers: 3)
Géotechnique Letters     Hybrid Journal   (Followers: 7)
GISAP : Technical Sciences, Construction and Architecture     Open Access  
HBRC Journal     Open Access   (Followers: 2)
Hormigón y Acero     Full-text available via subscription  
HVAC&R Research     Hybrid Journal  
Indonesian Journal of Urban and Environmental Technology     Open Access  
Indoor and Built Environment     Hybrid Journal   (Followers: 2)
Infrastructure Asset Management     Hybrid Journal   (Followers: 2)
Infrastructures     Open Access  
Ingenio Magno     Open Access   (Followers: 1)
Insight - Non-Destructive Testing and Condition Monitoring     Full-text available via subscription   (Followers: 22)
International Journal for Service Learning in Engineering     Open Access  
International Journal of 3-D Information Modeling     Full-text available via subscription   (Followers: 3)
International Journal of Advanced Structural Engineering     Open Access   (Followers: 16)
International Journal of Civil, Mechanical and Energy Science     Open Access   (Followers: 1)
International Journal of Concrete Structures and Materials     Open Access   (Followers: 14)
International Journal of Condition Monitoring     Full-text available via subscription   (Followers: 2)
International Journal of Construction Engineering and Management     Open Access   (Followers: 9)
International Journal of Geo-Engineering     Open Access   (Followers: 3)
International Journal of Geosynthetics and Ground Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Masonry Research and Innovation     Hybrid Journal   (Followers: 1)
International Journal of Pavement Research and Technology     Open Access   (Followers: 6)
International Journal of Protective Structures     Hybrid Journal   (Followers: 6)
International Journal of Steel Structures     Hybrid Journal   (Followers: 2)
International Journal of Structural Engineering     Hybrid Journal   (Followers: 10)
International Journal of Structural Integrity     Hybrid Journal   (Followers: 2)
International Journal of Structural Stability and Dynamics     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Built Environment     Open Access   (Followers: 4)
International Journal of Sustainable Construction Engineering and Technology     Open Access   (Followers: 8)
International Journal on Pavement Engineering & Asphalt Technology     Open Access   (Followers: 7)
International Journal Sustainable Construction & Design     Open Access  
Journal of Bridge Engineering     Full-text available via subscription   (Followers: 15)
Journal of Building Engineering     Hybrid Journal   (Followers: 1)
Journal of Building Materials and Structures     Open Access   (Followers: 2)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 6)
Journal of Civil Engineering and Construction Technology     Open Access   (Followers: 12)
Journal of Civil Engineering and Management     Hybrid Journal   (Followers: 7)
Journal of Civil Engineering and Science     Open Access   (Followers: 8)
Journal of Civil Engineering Research     Open Access   (Followers: 6)
Journal of Civil Engineering, Science and Technology     Open Access  
Journal of Civil Society     Hybrid Journal   (Followers: 4)
Journal of Civil Structural Health Monitoring     Hybrid Journal   (Followers: 4)
Journal of Composites for Construction     Full-text available via subscription   (Followers: 13)
Journal of Computing in Civil Engineering     Full-text available via subscription   (Followers: 24)
Journal of Construction Engineering     Open Access   (Followers: 7)
Journal of Construction Engineering and Management     Full-text available via subscription   (Followers: 19)
Journal of Constructional Steel Research     Hybrid Journal   (Followers: 8)
Journal of Earth Sciences and Geotechnical Engineering     Open Access   (Followers: 4)
Journal of Fluids and Structures     Hybrid Journal   (Followers: 6)
Journal of Frontiers in Construction Engineering     Open Access   (Followers: 2)
Journal of Green Building     Full-text available via subscription   (Followers: 11)
Journal of Highway and Transportation Research and Development (English Edition)     Full-text available via subscription   (Followers: 14)
Journal of Infrastructure Systems     Full-text available via subscription   (Followers: 21)
Journal of Legal Affairs and Dispute Resolution in Engineering and Construction     Full-text available via subscription   (Followers: 5)
Journal of Marine Science and Engineering     Open Access   (Followers: 1)
Journal of Materials and Engineering Structures     Open Access   (Followers: 5)
Journal of Materials in Civil Engineering     Full-text available via subscription   (Followers: 10)
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
Journal of Performance of Constructed Facilities     Full-text available via subscription   (Followers: 4)
Journal of Pipeline Systems Engineering and Practice     Full-text available via subscription   (Followers: 7)
Journal of Rehabilitation in Civil Engineering     Open Access   (Followers: 3)
Journal of Solid Waste Technology and Management     Full-text available via subscription   (Followers: 1)
Journal of Structural Engineering     Full-text available via subscription   (Followers: 40)
Journal of Structural Fire Engineering     Full-text available via subscription   (Followers: 6)
Journal of Sustainable Architecture and Civil Engineering     Open Access   (Followers: 3)
Journal of Sustainable Design and Applied Research in Innovative Engineering of the Built Environment     Open Access   (Followers: 1)
Journal of the Civil Engineering Forum     Open Access  
Journal of the South African Institution of Civil Engineering     Open Access   (Followers: 4)
Journal of Water and Environmental Nanotechnology     Open Access  
Jurnal Spektran     Open Access   (Followers: 1)
Jurnal Teknik Sipil dan Perencanaan     Open Access   (Followers: 1)
Konstruksia     Open Access  
KSCE Journal of Civil Engineering     Hybrid Journal   (Followers: 2)
Latin American Journal of Solids and Structures     Open Access   (Followers: 4)
Materiales de Construcción     Open Access  
Mathematical Modelling in Civil Engineering     Open Access   (Followers: 3)
Nondestructive Testing And Evaluation     Hybrid Journal   (Followers: 17)
npj Materials Degradation     Open Access  
Obras y Proyectos     Open Access   (Followers: 1)
Open Journal of Civil Engineering     Open Access   (Followers: 7)
Photonics and Nanostructures - Fundamentals and Applications     Hybrid Journal   (Followers: 2)
Practice Periodical on Structural Design and Construction     Full-text available via subscription   (Followers: 4)
Proceedings of the Institution of Civil Engineers - Bridge Engineering     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Civil Engineering     Hybrid Journal   (Followers: 12)
Proceedings of the Institution of Civil Engineers - Management, Procurement and Law     Hybrid Journal   (Followers: 8)
Proceedings of the Institution of Civil Engineers - Municipal Engineer     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Structures and Buildings     Hybrid Journal   (Followers: 4)
Random Structures and Algorithms     Hybrid Journal   (Followers: 5)
Research in Nondestructive Evaluation     Hybrid Journal   (Followers: 7)
Revista IBRACON de Estruturas e Materiais     Open Access   (Followers: 1)
Road Materials and Pavement Design     Hybrid Journal   (Followers: 11)
Russian Journal of Nondestructive Testing     Hybrid Journal   (Followers: 6)
Science and Engineering of Composite Materials     Hybrid Journal   (Followers: 61)
Selected Scientific Papers - Journal of Civil Engineering     Open Access   (Followers: 3)
Slovak Journal of Civil Engineering     Open Access   (Followers: 2)
Soils and foundations     Full-text available via subscription   (Followers: 5)
Steel Construction - Design and Research     Hybrid Journal   (Followers: 3)
Structural and Multidisciplinary Optimization     Hybrid Journal   (Followers: 10)
Structural Concrete     Hybrid Journal   (Followers: 11)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 9)
Structural Engineering International     Full-text available via subscription   (Followers: 12)
Structural Mechanics of Engineering Constructions and Buildings     Open Access  
Structural Safety     Hybrid Journal   (Followers: 7)
Structural Survey     Hybrid Journal  
Structure     Full-text available via subscription   (Followers: 23)
Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance     Hybrid Journal   (Followers: 13)
Structures     Hybrid Journal   (Followers: 1)
Study of Civil Engineering and Architecture     Open Access   (Followers: 9)
Superlattices and Microstructures     Hybrid Journal   (Followers: 2)
Surface Innovations     Hybrid Journal  
Technical Report Civil and Architectural Engineering     Open Access  
Teknik     Open Access  
The IES Journal Part A: Civil & Structural Engineering     Hybrid Journal   (Followers: 6)
The Structural Design of Tall and Special Buildings     Hybrid Journal   (Followers: 6)
Thin Films and Nanostructures     Full-text available via subscription   (Followers: 2)
Thin-Walled Structures     Hybrid Journal   (Followers: 4)
Transactions of the VŠB - Technical University of Ostrava. Construction Series     Open Access   (Followers: 1)
Transportation Geotechnics     Full-text available via subscription   (Followers: 1)
Transportation Infrastructure Geotechnology     Hybrid Journal   (Followers: 8)
Underground Space     Open Access  
Water Science & Technology     Partially Free   (Followers: 25)
Water Science and Technology : Water Supply     Partially Free   (Followers: 22)

           

Journal Cover HBRC Journal
  [2 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 1687-4048
   Published by Elsevier Homepage  [3118 journals]
  • Calcium alginate as an eco-friendly supporting material for Baker’s
           yeast strain in chromium bioremediation

    • Authors: M.S. Mahmoud; Samah A. Mohamed
      Pages: 245 - 254
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): M.S. Mahmoud, Samah A. Mohamed
      In this study, Baker’s yeast strain (Saccharomyces cerevisiae) biomass was immobilized in alginate extract 3% forming Biomass/Polymer Matrices Beads (BPMB). These beads were investigated for chromium biosorption from aqueous solution. Factors such as solution pH, contact times, temperature values, stirring rates, BPMB dosages and initial chromium ions concentrations were experimentally tested using repeated-batch process to determine the sorption capacity for chromium (VI) ions. Batch experiments were conducted at pH range from 1.5 to 7.5. The optimum pH value was 3.5 for direct chromium removal. The effect of chromium concentration was studied using different concentrations from 200 to 1000ppm. Freundlich’s isothermal model showed better representation of data than Langmuir’s isothermal model with correlation coefficient 0.922. The maximum biosorption capacity of chromium was found to be 154mgg−1 at initial concentration 200ppm under optimum conditions. At the end of the experiments, BPMB were investigated for chromium biosorption from tannery effluent sample. Results showed decrease in chromium concentration up to 85%. The availability of recycling of the BPMB was also studied for three subsequent cycles. The surface sequestration of metal ions by BPMB was characterized before and after metal binding using a scanning electron microscope (SEM) equipped with an energy dispersive X-ray analysis (EDXA) and FTIR spectroscopy in order to determine the mechanisms of chromium biosorption.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.06.003
       
  • The effect of replacing sand by iron slag on physical, mechanical and
           radiological properties of cement mortar

    • Authors: Ahmed S. Ouda; Hamdy A. Abdel-Gawwad
      Pages: 255 - 261
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Ahmed S. Ouda, Hamdy A. Abdel-Gawwad
      In the present study, the effects of replacing sand by high percentages of basic-oxygen furnace slag on the compressive strength, bulk density and gamma ray radiation shielding properties of mortar have been investigated. Cement mortar of mix proportion 1:3 including various percentages of iron slag was designed. The percentages of replacement were 0%, 40%, 80% and 100% by weight of fine aggregate. Mortar mixes were prepared with water cement ratio of 0.44 and cured in potable water for 90days. The attenuation measurements were performed using gamma spectrometer of NaI (Tl) detector. The utilized radiation sources comprised 137Cs and 60Co radioactive elements with photon energies of 0.662MeV for 137Cs and two energy levels of 1.17 and 1.33MeV for the 60Co. Likewise, half value layer (HVL), tenth value layer (TVL) and the mean free path (mfp) for the tested samples were measured. Results of this investigation indicated that the strength properties of mortars increased significantly upon replacing sand partially by iron slag. It was also observed that the inclusion of iron slag as partial replacement with fine aggregate enhances the bulk density of mortar. On the other hand, full sand replacement by iron slag has significant effects on shielding efficiency in thick shields, as it reduces the capture gamma rays better than normal mortar incorporating sand.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.06.005
       
  • Cyclic behavior of braced concrete frames: Experimental investigation and
           numerical simulation

    • Authors: Hadad S. Hadad; Ibrahim M. Metwally; Sameh El-Betar
      Pages: 262 - 270
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Hadad S. Hadad, Ibrahim M. Metwally, Sameh El-Betar
      RC shear walls have been widely used as the main lateral-load resisting system in medium and high-rise buildings because of their inherent large lateral stiffness and load resistance. But, in general, the energy dissipating capacity of RC shear walls is not very good and it is found that using the bracing system gives good results. The main purpose of this paper is to study the effect of the different types of bracing on the lateral load capacity of the frame. Also, the research contains a comparison between the braced and infilled frames to decide the best system. The research scheme consists of four frames; the bare frame, two frames one was braced with concrete, the second was braced with steel bracing and the fourth frame was infilled with solid cement bricks. All the specimens were tested under cyclic loading. The results gave some important conclusions as; braced and infilled the bare frames increased the lateral strength of the bare frame depending on the type of bracing and infill. Also, the different types of bracing and the infill increased the initial stiffness of the bare frame by a reasonable value. The energy dissipation for the braced and infilled frames is always higher than that for the bare frame up to failure. Also, numerical modeling was carried out with the nonlinear software platform (IDARC). The numerical results obtained with the calibrated nonlinear model are presented and compared with the experimental results. Good agreement was achieved between the numerical simulation and the test results.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2014.11.007
       
  • Properties of recycled concrete aggregate under different curing
           conditions

    • Authors: Ahmed Shaban Abdel-Hay
      Pages: 271 - 276
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Ahmed Shaban Abdel-Hay
      Construction and demolition wastes are produced every day around the world. Thus the idea of using recycled concrete aggregate in new concrete production appears to be an effective utilization of concrete waste. This paper presents the results of an experimental study to evaluate the effects of recycled concrete aggregate (RCA) percentages under different curing conditions. The percentages of recycled coarse aggregate to dolomite were (0:100%, 25:75%, 50:50%, 100:0%) respectively. The concrete properties which were studied were the mechanical properties (compressive and splitting strength) and mass transport properties (ISAT and sorptivity). The concrete specimens were exposed to three different curing conditions, moist (standard), open-air, and painted specimens using the substance (Curassol 1). The coarse recycled concrete aggregates were obtained by crushing a laboratory produced primary concrete at age of 28days. The results showed that curing using paint material was the most efficient method of curing at all ages and percentages of recycling except at 100% recycling, where the maximum value of both compressive and tensile strengths was obtained using water curing. Also, in moist curing, full replacement of coarse aggregates gave the highest compressive strength at age of 28days. In all cases of recycled aggregate ratios, curing using water caused a decrease in the concrete permeability.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.07.001
       
  • The effect of pile parameters on the factor of safety of piled-slopes
           using 3D numerical analysis

    • Authors: Ahmed Abdelaziz; Dahlia Hafez; Ashraf Hussein
      Pages: 277 - 285
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Ahmed Abdelaziz, Dahlia Hafez, Ashraf Hussein
      Slope stability can be achieved using different methods. Piles are commonly used to stabilize slopes or to improve slope stability. Stabilized slopes with piles are numerically studied in the current paper. A 3 dimensional (3D) finite element study is carried out to investigate the effect of different parameters on the stability of slopes stabilized with piles. A 3D finite element model was developed using the finite element program PLAXIS. The 3D model was verified using experimental data from the literature for a stabilized silty sand slope in a large-scale physical model. A parametric study was undertaken to study the effect of pile position, pile inclination, pile length and pile diameter on the factor of safety of the piled-slopes. The findings of the research were compared to other findings from the literature. The results show that using the 3D aspect gives more insight into the complicated slope stability problem. The study determines the optimum location of the pile and its optimum inclination to achieve the maximum stability. It shows that after a certain length of the pile, increasing the pile length becomes unnecessary and that the diameter of the pile has a relatively minor effect on the factor of safety of piled-slopes.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.06.002
       
  • Estimation of period of vibration for concrete shear wall buildings

    • Authors: Mohamed Naguib Abo El-saad; Magdy Israel Salama
      Pages: 286 - 290
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Mohamed Naguib Abo El-saad, Magdy Israel Salama
      Most seismic design codes generally provide formulas to be used for the estimation of the base shear and lateral loads. For the determination of the lateral loads, it is required to estimate first the fundamental vibration period of the building theoretically or experimentally (Uniform Building Code (UBC-1997); Structural Engineers Association of California (SEAOC-1996); Egyptian Code for Computation of Loads and Forces in Structural and Building Work (EGC-2012); Applied Technological Council, 1978). In various codes such as the current United States (US) and Egyptian building codes and also in the recommendations of many researches, empirical period formulas for concrete shear wall buildings relate the building fundamental period of vibration (T) to the building overall height (H). In this paper, using the available data for the fundamental vibration period of reinforced concrete shear wall buildings measured from their motions recorded during eight California earthquakes, improved formulas for estimating the fundamental period of vibration (T) of concrete shear wall buildings are developed by regression analysis of the measured period data. The results indicate that the value of coefficient Ct in the current US and Egyptian building codes formula should be decreased from its present value 0.02 to 0.014. Also, factors to limit the period calculated by rational analysis, such as Rayleigh’s method, are recommended in this paper. Comparisons between the periods determined using the proposed formula and the measured values show good agreement.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.08.001
       
  • Attributes and descriptors for building performance evaluation

    • Authors: S. Gopikrishnan; V.M. Topkar
      Pages: 291 - 296
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): S. Gopikrishnan, V.M. Topkar
      The feedback obtained from users/occupants would become the primary data set to evaluate performance of any built facility. Meeting user needs, expectations and aspirations are the prime objectives of a facility provider. It becomes necessary to evaluate the built facility with respect to meeting user needs/expectations, in order to obtain right feedback during building performance evaluation. Among various methods being used to obtain user feedback, questionnaire remains the foremost and most commonly used tool. The quality of feedback and its subsequent analysis entirely depend on the robustness of the questionnaire which in turn depends on its content. Such survey instrument comprises of questions framed on various attributes of a built facility. The purpose of survey dictates the nature of questions and the attributes about which the data are collected. These attributes can be categorized into functional attributes, maintenance attributes, and societal attributes. In order to obtain the right feedback in levels of satisfaction with respect to these attributes, there is a need to have appropriate descriptors for incorporation in a survey instrument. This paper identifies attributes that indicate building performance and provides simple description of these attributes based on which items can be generated for a questionnaire. Such items can enable any user/occupant to easily understand the characteristics of these attributes and offer an objective feedback during questionnaire survey.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.08.004
       
  • Using polypyrrole nanocomposites coated on rice husk ash for the removal
           of anions, heavy metals, COD from textile wastewater

    • Authors: Neama Ahmed Sobhy Ahmed Reyad
      Pages: 297 - 301
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Neama Ahmed Sobhy Ahmed Reyad
      In this study, a new application of polypyrrole (PPy) synthesized chemically in presence of ferric chloride as an oxidant coated on rice husk ash (RHA) by oxidative chemical polymerization method is used, ferric chloride has been found to be the chemical oxidant and water has been reported the best solvent for chemical polymerization of pyrrole. The removal of anions, heavy metals such as copper, iron and zinc and COD (chemical oxygen demand) from textile wastewater using completely mixed batch reactor (CMBR) technique is investigated when polypyrrole and its blend and nanocomposites with rice husk ash were used. Experiments were done using PPy/RHA during 30min with 5min intervals. It is observed that by increasing the time (5–20min) removal efficiency increased but, after 20min the efficiency did not increase significantly. It can be concluded that RHA in the composites does not play significant role in the anions and COD removal but the role of RHA in the removal of the metals is considerable and it causes an increase in the removal efficiency of the composites. Besides, the morphology was tested by scanning electron microscopy (SEM) to characterize the surface of PPy nanocomposites at very high magnification at an accelerating voltage of 15kV, and chemical structure was tested by Fourier Transform Infrared spectroscopy (FTIR) in the wavelength range of 400–4000cm−1, respectively. It was found that PPy/RHA can be used as an effective adsorbent in the removal of anions, heavy metals and COD from textile wastewater.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.08.002
       
  • Governance model for integrating organizational project management (OPM)
           with corporate practices

    • Authors: Amr Mossalam; Mohamad Arafa
      Pages: 302 - 314
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Amr Mossalam, Mohamad Arafa
      Governance is becoming more important for sustaining success and ensuring continuous delivery of business value to organizations. Most organizations are competing to deliver the highest level of service and attaining stakeholders’ satisfaction. Implementing sound organizational project management governance framework can enable the kind of visibility and control that are essential to successfully deliver the expected benefits from projects and portfolios. The market survey conducted by the authors revealed that the current level of integration between organizational project management (OPM) and other relevant practices is not enough and there is a need to have a unified integrated model that links OPM with other governance components (practices/systems) such as strategy management, enterprise risk management, internal audit, Quality management, performance management, business excellence and lessons learned. The survey also concluded that there is a good opportunity for automating the model to achieve better visibility and effective resource usage. Having proposed the model, it needed validation, which was done through implementing the model in organizations through automation projects. The implementation resulted in some changes in the model to achieve the required levels of accountability, responsibility, and transparency. These changes were incorporated into the model and were reflected in its modified version. Finally, the paper highlighted the recommended improvements that would enhance the future implementation of the model.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.08.003
       
  • The drawbacks of housing overcrowding characteristic to rural
           migrants’ life in Beijing

    • Authors: Liu Wen Tao
      Pages: 315 - 320
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Liu Wen Tao
      Chinese government did great contribution in improving the residents’ housing characteristics and was quite successful especially in urban area. However, in the big cities, the negative interrelationships between housing overcrowding characteristic and people’s life still emerge and seriously affect people’s life. In this research, the researcher will investigate the capital city Beijing as the target and to know the situation of housing overcrowding problem, also do some implication to the rural migrants’ life. By the way, some suggestions will be forward in solving the housing overcrowding problem in Beijing among rural migrants. At the end, the Beijing local government should take some necessary actions to carry out the housing policy. In this research, the researcher obtains the data from two types of interviews: rural migrants and government officers. It is also supported by the utilization of secondary data. The findings of this research indicate that majority of the rural migrants endure by the housing overcrowding problem, also this housing problem seriously implies to their regular life in Beijing. Therefore, the Beijing government should provide some necessary assistance to this group people. This paper reports the housing overcrowding problem in Beijing and does the implications to the rural migrants’ life. It also provides some suitable advice to other urban areas in solving the housing overcrowding problem.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.11.002
       
  • Further step beyond green - From distractive, to balance, towards
           restorative built environment

    • Authors: AbdelRahman AbdelNaeem AbdelLatif Mohamed
      Pages: 321 - 330
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): AbdelRahman AbdelNaeem AbdelLatif Mohamed
      This main concern of the paper is to elaborate developing strategies and trends which strive for achieving sustainability in building and urban design to create sustainable built environment. Also discuss how far the conventional building practicing and construction activities lead to many serious negative impacts on our natural environment. The main goals of establishing green agenda, in the 2nd half of last century, were to minimize these distractive impacts and seek out a balance between built and natural environment. By the millennium end was discovered that, more pleasing and enjoyable human built environment is not only guaranteed by reducing the harm that stems from constructions and creating buildings which provided protection with the benefits of natural elements. “For some, green architecture is a black and white definition, set by LEED (Leadership in Energy and Environmental Design) standards.” Many new movements, like biophilic design, have recently gained much momentum within the building community, which provide further step beyond green to restore beneficial contacts between people and natural environment. While the green movement has often focused on the means, biophilic design tends toward emphasizing the end results, establishing natural-based habitats for humans to live and work. Biophilic Design incorporates green building ideas, but considers that true sustainability must include quality of life issues involving human physiological & psychological-healthand well-being. So, Biophilic design incorporates elements derived from nature in order to maximize human functioning and health.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.11.001
       
  • Effect of demolition/construction wastes on the properties of alkali
           activated slag cement

    • Authors: Sayieda R. Zedan; Maha R. Mohamed; Doaa A. Ahmed; Aya H. Mohammed
      Pages: 331 - 336
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Sayieda R. Zedan, Maha R. Mohamed, Doaa A. Ahmed, Aya H. Mohammed
      The key point of this investigation is to study the effect of demolition and building wastes on the physico-chemical and mechanical properties of alkali activated slag (AAS). In this study, ground granulated blast-furnace slag (GGBFS) was activated by mixture of 3:3wt.% sodium hydroxide:liquid sodium silicate (NaOH:Na2SiO3) ratio by weight of GGBFS. AAS was individually replaced by 10wt.% ceramic, red clay brick and concrete wastes (CW, RCBW and CoW). The results showed that, significant shorter setting times were observed when AAS was replaced by CW, RCBW or CoW. The AAS-CoW showed the shortest setting times compared to other all mixes. The chemically combined water and pH decreased in the direction of AAS-CoW>AAS>AAS-RCBW>AAS-CW. CoW has a positive effect on the compressive strength development at one day of curing, while, CW and RCBW have a negative effect at the same time (1day). At later ages of curing, the AAS-RCBW showed the highest compressive strength values as compared with AAS-CW, AAS-CoW and AAS. The crystallinity degree of hydration products enhanced when AAS was replaced by these wastes. Also, the Fe2O3 present in waste played an important role on the development of compressive strength. The hydration products were investigated using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) and the results were compared with the development in compressive strength.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.12.001
       
  • A methodology for energy performance classification of residential
           building stock of Hamirpur

    • Authors: Aniket Sharma; Bhanu M. Marwaha
      Pages: 337 - 352
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Aniket Sharma, Bhanu M. Marwaha
      In India, there are various codes, standards, guidelines and rating systems launched to make energy intensive and large sized buildings energy efficient whereas independent residential buildings are not covered even though they exist most in numbers of total housing stock. This paper presents a case study methodology for energy performance assessment of existing residential stock of Hamirpur that can be used to develop suitable energy efficiency regulations. The paper discusses the trend of residential development in Hamirpur followed by classification based on usage, condition, predominant material use, ownership size and number of rooms, source of lighting, assets available, number of storey and plot sizes using primary and secondary data. It results in identification of predominant materials used and other characteristics in each of urban and rural area. Further cradle to site embodied energy index of various dominant building materials and their market available alternative materials is calculated from secondary literature and by calculating transportation energy. One representative existing building is selected in each of urban and rural area and their energy performance is evaluated for material embodied energy and operational energy using simulation. Further alternatives are developed based on other dominant materials in each area and evaluated for change in embodied and operational energy. This paper identifies the energy performance of representative houses for both areas and in no way advocates the preference of one type over another. The paper demonstrates a methodology by which energy performance assessment of houses shall be done and also highlights further research.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.11.003
       
  • Simplified reliable prediction method for determining the volume change of
           expansive soils based on simply physical tests

    • Authors: Hossam Elbadry
      Pages: 353 - 360
      Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3
      Author(s): Hossam Elbadry
      Expansive soils widely exist at different locations in nearly all new construction sites in Egypt. This type of soil exhibits significant change in volume when subjected to water, leading to distortions in the structures and therefore huge monetary losses due to repair and in some cases to full removal of the structures. An oedometer test is the widely used and most accurate apparatus that measures the volume change of the natural expansive soils. This traditional test needs high effort, high cost, and long time consuming to carry out causing true difficulties to execute a large number of swelling tests within the same time as essential requirements of the large projects. Thus, several researchers worldwide have made significant contributions through past long years to better obtain prediction of volume change behavior in natural expansive soils. Reliable and satisfied prediction occurs when its result is being so close to the results obtained by the oedometer apparatus. The current study introduces a novel approach of considerable positive reliable prediction for volume change behavior in expansive soils by using only the results of some simply executed standard physical tests. The approach philosophy is to significantly facilitate the efforts exerted by geotechnical engineers to determine reliable results of the mechanical properties for an enormous amount of expansive soil samples that suits the project needs which are hard to obtain by the ordinary experimental work by the oedometer apparatus only.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2015.10.001
       
  • Investigating effects of boundary conditions on the evaluation of R-factor
           of un-braced steel frames

    • Authors: Masood M.M. Irheem; Walid A. Attia
      Pages: 123 - 132
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Masood M.M. Irheem, Walid A. Attia
      Design of Structures to resist seismic load depends on the theory of dissipation in elastic of energy that already exists in response modification factor “R-factor”. The main problem in codes gives a constant value for R-factor, since change in boundary conditions of building change in behavior of steel frame structures and that effect on R-factor. This study is an attempt to assess overstrength, ductility and response modification factor of un-braced steel frames under change in boundary conditions as change in the direction of strong axis of column and support type beside to variation in story and bay number to be 9 frame and each frame has 8 different boundary conditions as sum of 72 case for analysis. These frames were analyzed by using nonlinear static “pushover” analysis using SAP2000 program. As a result of this study R-factor does not has a constant value, when change in boundary conditions R-factor directly changes, minimum value of 8 boundary conditions is close to the code value that is mean the code is more conservative and give a large factor of safety. Ductility reduction factor increases with increasing number of story for all boundary conditions, but overstrength has different rule. Response modification factor, overstrength factor and ductility reduction factor decrease when fundamentals period increasing for the studied frames.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.06.006
       
  • Vibration control of buildings by using partial floor loads as multiple
           tuned mass dampers

    • Authors: Tharwat A. Sakr
      Pages: 133 - 144
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Tharwat A. Sakr
      Tuned mass dampers (TMDs) are considered as the most common control devices used for protecting high-rise buildings from vibrations. Because of their simplicity and efficiency, they have found wide practical applications in high-rise buildings around the world. This paper proposes an innovative technique for using partial floor loads as multiple TMDs at limited number of floors. This technique eliminates complications resulting from the addition of huge masses required for response control and maintains the mass of the original structure without any added loads. The effects of using partial loads of limited floors starting from the top as TMDs on the vibration response of buildings to wind and earthquakes are investigated. The effects of applying the proposed technique to buildings with different heights and characteristics are also investigated. A parametric study is carried out to illustrate how the behavior of a building is affected by the number of stories and the portion of the floor utilized as TMDs. Results indicate the effectiveness of the proposed control technique in enhancing the drift, acceleration, and force response of buildings to wind and earthquakes. The response of buildings to wind and earthquakes was observed to be more enhanced by increasing the story-mass ratios and the number of floor utilized as TMDs.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.04.004
       
  • Effect of discrete glass fibers on the behavior of R.C. Beams exposed to
           fire

    • Authors: Magdy Riad; M.M. Genidi; Ata El-kareim Shoeib; Sherif F.M. Abd Elnaby
      Pages: 145 - 151
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Magdy Riad, M.M. Genidi, Ata El-kareim Shoeib, Sherif F.M. Abd Elnaby
      The main objective of this paper is to investigate the effect of adding discrete glass fibers on the behavior of reinforced concrete (RC) beams under different fire and cooling conditions. Eighteen beams with different concrete compressive strengths were tested to study the behavior of reinforced concrete (RC) beams containing discrete glass fibers when exposed to different fire and cooling conditions. Nine beams were prepared from normal strength concrete (NSC) with compressive strength equal to 35MPa while the other beams were prepared from high strength concrete (HSC) with compressive strength equal to 60MPa. The beams contained different contents of discrete glass fibers. The modes of failure of tested specimens show that the crack patterns change according to fire condition and fiber content. Analysis of test results show that adding discrete glass fibers to NSC increased the residual stiffness of the tested specimens after firing and decreased the rate of the deflection gain during firing. Also adding fibers to concrete has a limited positive effect on the ultimate strength of the specimens compared to the control specimens. Its effect on deflection due to fire is more pronounced. Finally, the recommended optimum ratio of discrete glass fibers is not more than 0.5% of the total concrete weight.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2014.11.005
       
  • Structural analysis of a composite continuous girder with a single
           rectangular web opening

    • Authors: Mohamed A. ElShaer
      Pages: 152 - 162
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Mohamed A. ElShaer
      In the design of most bridge girders with composite girders composed of steel–concrete composite plate girders, an opening in the steel girder is often used to provide passage for utility ducts and pipes. This results in significant savings in material and construction costs. So it is necessary to study the effect of an opening in the web steel on the behavior of the composite girders if the designer wishes to provide adequate opening in the structural elements without reducing its load carrying capacity. In this paper, a non-linear finite element analysis has been done to analyze the deflection in the steel section and internal stresses in the concrete slab for continuous composite girders with a single rectangular opening in the steel web. ANSYS computer program (version 15) has been used to analyze the three-dimensional model. The reliability of the model was demonstrated by comparison with experimental results of continuous composite beams without an opening in the steel web carried out by another author. The parametric analysis was executed to investigate the width, height, and position of the opening in one span on the behavior of a composite girder under vertical load. The results indicated that when the width of opening is less than 0.05 of length of a single span and the height is less than 0.15 of the steel web, the deflection and internal stresses increased less than 10% comparing to continuous composite girders without an opening.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.06.004
       
  • Effect of geometric imperfections on the ultimate moment capacity of
           cold-formed sigma-shape sections

    • Authors: Bassem L. Gendy; M.T. Hanna
      Pages: 163 - 170
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Bassem L. Gendy, M.T. Hanna
      In recent years, cold formed steel sections are used more and more as primary framing components and as a secondary structural system. They are used as purlins and side rails or floor joist, and after that in the building envelops. Beams are not perfectly straight and are usually associated with geometric imperfections. Initial geometric imperfections can significantly influence the stability response of cold-formed steel members. This paper reports a numerical investigation concerning the effect of these imperfections on the behavior of the simply supported beams subjected to a uniform bending moment. The beam profile is cold formed sigma sections. Group of beams with different overall member slenderness ratios were studied. Several approaches have been utilized to model the geometric imperfections. First, the elastic buckling modes were considered as the imperfect beam shape. In this approach, the elastic buckling analysis was done first to get the elastic buckling modes. In the second approach, the imperfections were considered by assuming the beam bent in a half sine wave along its length. Finally, combination of these two approaches was considered. Results reveal that, the ultimate bending moments of beams with short and intermediate overall slenderness ratios are sensitive to the imperfect shape that comprise compression flange local buckling.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.04.006
       
  • Seismic performance of existing R.C. framed buildings

    • Authors: Sameh A. El-Betar
      Pages: 171 - 180
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Sameh A. El-Betar
      The earthquakes disasters basically occur due to buildings damage not because of the earth shaking. Therefore, the countries have being updated the seismic codes. The seismic loads for buildings design in Egyptian Code have been changed from (EC-1994) to (ECP-201, 2012). On the other hand, the need is raised to study the vulnerability of existing buildings, which can be divided into the buildings designed to resist the gravity loads only (GLD) and the buildings designed according to Egyptian code (EC-1994). Comparison between forces due to Egyptian code for loads (EC-1994) and (ECP-201, 2012) is carried out on the multi-stories R.C. framed buildings which are the most common type of existing buildings in Egypt. To investigate the vulnerability of existing buildings, nonlinear static pushover analysis is conducted to evaluate the real strength of the existing buildings. Moreover, it is considered a useful and effective tool for the performance of three framed buildings: 3, 6 and 10 stories due to expected future earthquakes. Finally, it is found that the vulnerability of existing GLD buildings occurs at expected ground accelerations (ag ) greater than 0.125g in Egyptian seismic map, while the EC-94 designed buildings behave elastically up to (ag ) equals to 0.2g and above that a slight damage may occur.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.06.001
       
  • Application of ultimate limit state design for axially loaded single piles
           in Egyptian geotechnical practice

    • Authors: Yasser M. El-Mossallamy; Mohamed M. Tawfik; M.A. Zayed
      Pages: 181 - 189
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Yasser M. El-Mossallamy, Mohamed M. Tawfik, M.A. Zayed
      For a long time, the framework of geotechnical design in Egypt has been based mainly on Working Stress Design (WSD) philosophy with the global safety concept as presented in the current version of the Egyptian Code of Practice for Soil Mechanics and Foundations Design and Construction [1]. This design philosophy is supported by long-term experience, considering local experiences and is adopted to fulfill the required safety margin. Limit State Design (LSD) philosophy, on the other side, has already been applied for the design of reinforced concrete structures as introduced in the Egyptian Code of Practice for the Design and Construction of Reinforced Concrete Structures [2]. Applying LSD for superstructure and WSD for foundations often results in design misleading because of the incompatibility between the two design philosophies. Accordingly, implementation of LSD philosophy for geotechnical designs in Egypt has become mandatory and the transition to this new design philosophy of LSD should be as smooth and gradual as possible to allow for a better acceptance by the Egyptian geotechnical community. LSD philosophy using partial safety factors has been applied worldwide using two different approaches; factored strength approach and factored resistance approach. During this study, resistance reduction factors are calibrated on the basis of calibration-by-fitting technique, to be used with factored resistance approach for axially loaded single piles. The calibrated resistance reduction factors from this study are found to be relatively consistent with those values adopted in other geotechnical design codes worldwide.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.02.004
       
  • A systems engineering approach for realizing sustainability in
           infrastructure projects

    • Authors: Mohamed Matar; Hesham Osman; Maged Georgy; Azza Abou-Zeid; Moheeb El-Said
      Pages: 190 - 201
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Mohamed Matar, Hesham Osman, Maged Georgy, Azza Abou-Zeid, Moheeb El-Said
      Sustainability is very quickly becoming a fundamental requirement of the construction industry as it delivers its projects; whether buildings or infrastructures. Throughout more than two decades, a plethora of modeling schemes, evaluation tools and rating systems have been introduced en route to realizing sustainable construction. Many of these, however, lack consensus on evaluation criteria, a robust scientific model that captures the logic behind their sustainability performance evaluation, and therefore experience discrepancies between rated results and actual performance. Moreover, very few of the evaluation tools available satisfactorily address infrastructure projects. This paper introduces a systems model that abstracts the environment, the construction product, and its production system as three interacting systems that basically exchange materials, energy and information. The model utilizes this setup to capture and quantify essential flows exchanged between such three systems, with the objective of evaluating sustainability. The paper walks through the development of a generic case of the model, and then demonstrates its utility in evaluating the sustainability performance of civil infrastructure projects using a typical water pipeline installation project that uses horizontal directional drilling (HDD) technology as a trenchless installation method. The developed model addresses an identified gap within the current body of knowledge by considering infrastructure projects. Through the ability to simulate different scenarios, the model enables identifying which activities, products, and processes impact the environment more, and hence potential areas for optimization and improvement.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.04.005
       
  • Identification and assessment of risk factors affecting construction
           projects

    • Authors: Mohamed Sayed Bassiony Ahmed Abd El-Karim; Omar Aly Mosa El Nawawy; Ahmed Mohamed Abdel-Alim
      Pages: 202 - 216
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Mohamed Sayed Bassiony Ahmed Abd El-Karim, Omar Aly Mosa El Nawawy, Ahmed Mohamed Abdel-Alim
      Cost saving and time performance are usually essential to all parties who are involved in a construction project, that is owner, contractor, subcontractor. The main causes of disputes in construction projects involve delay and failure to complete the work in the specified cost and time frame. The delivery time of a project is a key factor to the owner in terms of cost as much as it is for the contractor. Unexpected increase in cost and delays in construction projects are caused by owner, contractor, environments, etc. in which several types of risk factors may occur concurrently. The effect of cost overrun and schedule overrun do not only influence the construction industry but the overall economy as well. Even though construction project increasing in cost and schedule has received extensive attention of researchers, but because of continuous changes and development in the field, the study considered of added value to the construction industry in Egypt, in addition to risk strategy and plan analysis. In order to meet the deadline of a project and due to the complex nature of construction projects, cost and scheduling should be flexible enough to accommodate changes without negatively affecting the overall project cost and duration. As such, the objectives of the presented research in this paper are to identify, study, and assess the effect of the factors that affect cost and time contingency. Data are collected from sixteen construction companies in Egypt. The collected data, output charts and analyses spreadsheets will be used for the development of computerized model built by the authors with identification abbreviation RIAM.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.05.001
       
  • Investigating the significance of landscape in designing library by
           emphasizing on the enhancement of learning

    • Authors: Parinaz Motealleh; Mojtaba Parsaee; Mehdi Sheybani
      Pages: 217 - 222
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Parinaz Motealleh, Mojtaba Parsaee, Mehdi Sheybani
      Numerous studies have been carried out related to landscape, landscape architecture and urban landscape and it indicates the significance of this issue among designers and scholars. These studies have been dealt with different aspects of landscape and investigated the reciprocal effects between landscape and human. In fact, landscape is recognized as a part of environment; thus as environment and human have a dynamic and reciprocal relationship, landscape has such an affordances. Indeed, landscape can create peace and cheerfulness for users due to its affordances. According to this view, the following research investigates the significance of landscape in designing library and clarifies the different aspects of its influence on the library space. Therefore, the outcomings of this research present a conceptual model from the integration of landscape and library space with the purpose of enhancing learning process. The research method is qualitative and it is based on descriptive–interpretative approach. This study investigates initially the concept of landscape and landscape architecture; then, it deals with the analysis of the relation between landscape and environment. After studying the affordances of environment and landscape from different perspectives, the environment of the library and the circumstances in which users study are analyzed. Finally, the findings of the research are presented based on the investigation and analysis.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2014.12.007
       
  • Cost vs. safety: A novel design for tornado proof homes

    • Authors: Komali Kantamaneni; Ibrahim Alrashed; Micheal Phillips
      Pages: 223 - 232
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Komali Kantamaneni, Ibrahim Alrashed, Micheal Phillips
      Tornadoes are dangerous and destructive weather phenomena. The strongest category of tornadoes on the enhanced Fujita and TORRO scales is responsible for 75% of property destruction and deaths across the globe. These issues highlight the need for new design practices aimed at producing tornado proof homes in particular 3D CAD models in tornado prone zones at current climatic scenarios. Previous studies were entirely based on traditional slants and failed to offer a reliable tornado proof home, other than small rooms and trailers, while, none of the literature concentrated on multiple factors (cost, safety and high-wind proof). Therefore, a knowledge gap exists. In order to address the current research gap, this study attempts to develop an innovative 3D CAD model for tornado resistant homes by incorporating 2 PA (Two Path Analysis). Consequently, this study provides a new design using a 3D-CAD model for a tornado resistant home as in Path One and cost and safety scenarios in Path Two. However, this new design utilizes missile steel and shield technology. Preliminary results showed that, while this new design is safer and more technically sophisticated, it involves an increase of 25–30% in construction costs. However, this increased expense is low in comparison with rebuilding costs.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.05.004
       
  • Evaluate the continuity of meeting items requirements when assessing
           buildings environmentally

    • Authors: Amal Kamal Mohamed Shamseldin
      Pages: 233 - 243
      Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2
      Author(s): Amal Kamal Mohamed Shamseldin
      Green architecture emerged as a way to address environmental problems related to buildings. Various methods have been developed to assess environmental performance, such as LEED in the United States, BREEAM in the United Kingdom, and GPRS in Egypt. The accuracy of these methods is highly important, especially considering the global trend toward requiring proof of environmental efficiency for construction permits. However, obtaining accurate results requires taking into account the variables that affect the environmental assessment. These variables include the impact of natural and human changes that occur periodically (the repetition of certain events according to day, month, and year), sequentially (changes over time), and suddenly (disasters and other unexpected events). These relationships are not addressed in current assessment methods. Since assessment has several targets, including developing a system to compare buildings according to a specific, unified scale, designers must compete to meet environmental standards based on a fair comparison; thus, the treatment of several variable effects must be obtained to reach those goals. This study, therefore, proposes an approach for considering the effects of variables when assessing item requirements. By measuring the continuity of meeting the item requirements across different time periods, this approach can achieve higher accuracy and justice in evaluation results than afforded by current methods.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2015.05.003
       
  • Effect of elevated temperature on the properties of silica fume and
           recycled rubber-filled high strength concretes (RHSC)

    • Authors: Magda I. Mousa
      Pages: 1 - 7
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Magda I. Mousa
      This paper presents the influence of temperature on the compressive strength of HSC with silica fume and containing different ratios and sizes of recycled tire rubber. The aims of including elastomeric material in a cementitious matrix are reducing the stiffness of HSC in order to make it compatible with other materials of the building, recycling of solid wastes and improving fire resistance. The inclusion of low mass fraction recycled rubber reduces the high risk of explosive spalling of HSC under high temperature because water vapour can exit through channels where the polymeric material gets burned. Two groups of concrete were employed to carry out this study. The first group consists of four mixes produced with a cement content of 500kg, 0.3 water–binder ratio, gravel as coarse aggregate and 0%, 10%, 15%, and 20% silica fume (SF) replaced of cement weight. The concrete formulation of the second group (four mixes) was produced with the replacement of cement by 20% SF along with 0%, 3%, 5% recycled fine rubber (2mm) and 3% coarse rubber (5mm). Dolomite as a coarse aggregate was used in the second group in order to improve the performance of concrete mixtures containing rubber under high temperature. The results obtained show high resistance to fire with increasing SF content up to 20% replacement of cement. Additional improvement was obtained with using dolomite and 3% of recycled rubber (2mm, 5mm).

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.03.002
       
  • Thermal analysis of reinforced concrete beams and frames

    • Authors: Essam H. El-Tayeb; Salah E. El-Metwally; Hamed S. Askar; Ahmed M. Yousef
      Pages: 8 - 24
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Essam H. El-Tayeb, Salah E. El-Metwally, Hamed S. Askar, Ahmed M. Yousef
      It is known that changes in temperature may produce stresses in concrete structures of mainly the same order of magnitude as the dead and live loads in some cases. However, the stresses due to temperature are produced only when the thermal expansion or contraction is restrained. In this paper, the behavior of reinforced concrete beams and frames is studied under thermal loads, with the presence of dead and live loads, in order to examine the effect of temperature variation. The beams and frames are modeled properly by accounting for material nonlinearity, particularly cracking. Different temperature gradients, uniform, linear and nonlinear, are considered. The finite element method is employed for conducting the analysis utilizing the computer code ABAQUS. The obtained results of the studied cases reveal that material modeling of reinforced concrete beams and frames plays a major role in how these structures react to temperature variation. Cracking contributes to the release of significant portion of temperature restrain and in some cases this restrain is almost eliminated. The response of beams and frames deviates significantly based on the temperature gradient, linear or nonlinear; hence, the nonlinear temperature gradient which is the realistic profile is important to implement in the analysis.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.02.001
       
  • Three-dimensional nonlinear finite element analysis of concrete deep beam
           reinforced with GFRP bars

    • Authors: Ibrahim M. Metwally
      Pages: 25 - 38
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Ibrahim M. Metwally
      The efficient use of FRP reinforcement in deep members has been hindered due to a lack of knowledge on the behavior of such members. Till now, most of researches have mainly focused on the flexural or shear behavior of shallow members longitudinally reinforced with FRP and most of them used testing at small scales. This paper presents numerical investigation of twelve large-scale concrete deep beams internally reinforced with GFRP bars without web reinforcement failed in shear which were experimentally tested and collected from literature. The collected specimens cover several parameters which usually influenced strength and behavior of deep beams as shear span/depth ratio, the reinforcement ratio, the effective depth, and the concrete strength. Concrete deep beams are generally analyzed using conventional methods such as empirical equations or strut and tie models. These methods however do not take into account the redistribution of forces resulting from non-linear materials’ behaviors. To address this issue, non-linear finite element analysis that incorporates non-linear material behavior as ABAQUS package is used. It was found efficient in handling such analysis; the proposed simulation of the material in the present study is capable of predicting the real behavior of reinforced concrete deep beam reinforced with GFRP bars in terms of load–deflection behavior, failure load, failure mode, crack propagation, GFRP reinforcement strain, and concrete strain distribution, similar to the tested large scale deep beams.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.02.006
       
  • Calibrations for volume change measurements using osmotic suction control
           technique

    • Authors: Mohamed F. Abbas; Tamer Y. Elkady; Mosleh A. Al-Shamrani
      Pages: 39 - 46
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Mohamed F. Abbas, Tamer Y. Elkady, Mosleh A. Al-Shamrani
      Evaluation of the volume change behavior of expansive soils under controlled suction and boundary conditions is important for the proper design of different geotechnical systems. Osmotic technique was used by several researchers for suction controlled testing of expansive soil specimens. This technique involves circulating polyethylene glycol solution (PEG) over a semi-permeable membrane underlying a test specimen. Different suction controlled testing apparatuses incorporating osmotic techniques were developed included triaxial and oedometric testing conditions to simulate different boundary conditions. This paper describes a series of calibration performed on suction controlled modified oedometer and triaxial equipment used for testing expansive soil. The modified oedometer, developed by the authors, comprises of thin-wall oedometer ring instrumented with strain gauges to measure the lateral stresses evolving during the test. The first part of this paper introduces the errors that arise during osmotic suction testing, concerning the device flexibility and PEG solution losses. The second part of the paper highlights the calibration procedure for estimating lateral stresses in modified oedometer from instrumented strain gauges as well as introduces a correction for the temperature fluctuation. Finally, the effect of triaxial cell flexibility on the volume change measured during osmotic suction controlled testing as well as temperature effect on volume change measurements were evaluated and correction procedures were introduced.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.03.003
       
  • On the evaluation of pre-consolidation pressure of undisturbed saturated
           clays

    • Authors: Adel H. Hammam; Ashraf I. Abel-Salam; Mostafa A. Yousf
      Pages: 47 - 53
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Adel H. Hammam, Ashraf I. Abel-Salam, Mostafa A. Yousf
      The objective of this research was to show the effect of sample disturbance on the values of pre-consolidation pressure бc by using Schmertmann method. A prediction of бc form pocket penetrometer is also achieved. This was carried out by comparing the values of бc that were estimated from the results of consolidation tests, with the readings of pocket penetrometer for same samples. Pocket penetrometer is a simple tool that can be easily used in field and laboratory to initially predict unconfined compressive strength for clayey soils. Before carrying out the consolidation tests on undisturbed samples, pocket penetrometer readings were recorded. The correlation obtained between pocket reading and бc values that resulted from consolidation tests was found to be valid for a wide range of clay stiffness, ranging between medium stiff to very stiff clay. As for soft clay, this correlation was found not to be applicable where its behavior is believed to be greatly affected by the degree of disturbance occurring to samples during drilling.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.02.003
       
  • Budget allocation for water mains rehabilitation projects using
           Simos’ procedure

    • Authors: Mohamed Marzouk; Said Abdel Hamid
      Pages: 54 - 60
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Mohamed Marzouk, Said Abdel Hamid
      Water mains rehabilitation projects’ budget allocation is considered the most important challenge that faces the engineers and the decision maker in governments and municipalities, especially when it is limited. This paper presents a methodology for water mains rehabilitation projects’ budget allocation. The proposed methodology consists of two models: (1) the grade classification model; and (2) the project ranking model. The grade classification model uses significant sustainability development criteria such as: economic; social; and environmental criteria. The main function of the grade classification model is to classify the projects into five grade level (lowest, low, medium, high, and very high), whereas, the main function of the project ranking model is to rank the projects at the same level in descending order according to their weighted scoring value. A factor’s numerical grade scales have been established to adjust the factor’s scoring in the project ranking model. Simos’ procedure is integrated with the scoring factors model to develop the grade classification model. A numerical example is provided to demonstrate the proposed methodology.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.04.003
       
  • An investigation into the former consulate of Britain as one of the first
           samples of modern architecture in Iran

    • Authors: Mojtaba Parsaee; Parinaz Motealleh; Mohamad Parva
      Pages: 61 - 71
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Mojtaba Parsaee, Parinaz Motealleh, Mohamad Parva
      The Bushehr city (Iran) had been the center of attention in different historical periods by foreign countries and central government due to political and economic strategic position in Persian Gulf. The situation and condition of Bushehr, especially in Qajar era, caused that the city encountered the changes and reformations as a result of both inner and outer factors. So, the modernism process occurred in this city not long after it had emerged in Europe. So that, some buildings were built in the city which contained the features of modernism. This research, at first, introduces the former consulate of Britain (Sabzabad edifice) and discovers when the building was built based on a historical-interpretative method. After that, the principals of modern architecture are explained from the different theorists’ stand point and also the characteristics of early modern architecture in Iran are explained. Finally, by describing the Bushehr condition in the early arrival of modernism, a qualitative and adaptive comparison has been done between Sabzabad architectural mechanism and the principals of modern architecture and its features in Iran. Thus, Sabzabad edifice is regarded as one of the first samples of modern architecture in Iran. The results of this research demonstrate the political, economic and also the architectural status of Bushehr city in the process of modernism in Iran which has been neglected by researchers and historians thus far.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.01.002
       
  • Compatibility of global environmental assessment methods of buildings with
           an Egyptian energy code

    • Authors: Amal Kamal Mohamed Shamseldin
      Pages: 72 - 82
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Amal Kamal Mohamed Shamseldin
      Several environmental assessment methods of buildings had emerged over the world to set environmental classifications for buildings, such as the American method “Leadership in Energy and Environmental Design” (LEED) the most widespread one. Several countries decided to put their own assessment methods to catch up with the previous orientation, such as Egypt. The main goal of putting the Egyptian method was to impose the voluntary local energy efficiency codes. Through a local survey, it was clearly noted that many of the construction makers in Egypt do not even know the local method, and whom are interested in the environmental assessment of buildings seek to apply LEED rather than anything else. Therefore, several questions appear about the American method compatibility with the Egyptian energy codes – that contain the most exact characteristics and requirements and give the outmost credible energy efficiency results for buildings in Egypt-, and the possibility of finding another global method that gives closer results to those of the Egyptian codes, especially with the great variety of energy efficiency measurement approaches used among the different assessment methods. So, the researcher is trying to find the compatibility of using non-local assessment methods with the local energy efficiency codes. Thus, if the results are not compatible, the Egyptian government should take several steps to increase the local building sector awareness of the Egyptian method to benefit these codes, and it should begin to enforce it within the building permits after a proper guidance and feedback.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.04.002
       
  • Requirements for establishing an information system to manage issuing
           building permits

    • Authors: Mona Mahrous Abdel Wahed
      Pages: 83 - 88
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Mona Mahrous Abdel Wahed
      The Egyptian Urban suffers from many negative aspects. This urban deterioration cannot be confined to a specific factor or a single reason, it may be because of the master plans itself, perhaps for reasons related to managing the urban development, or because of the process of issuing building permits, may be that the social environment is the reason, it can also be the financial policies, as well as the efficiency of local administrations employees, and the multiplicity of actors involved in the implementation process and the lack of coordination between them. The processes of development control and issuing building permits are important reasons in the problems facing the urban deterioration. To overcome most of these problems it is important to introduce a powerful technology that can be utilized in issuing building permits. GIS is an excellent choice for managing issuing building permits. The paper proposes a mechanism of an Information System to support and manage the building permits processes. It defines the user requirements and formulates the System Architecture, which identifies the essential components and processes, and their functional relationships. In order to introduce the proposed mechanism the following points were studied: 1. Identify the organizations involved in the process of issuing building permits. 2. Identify the needs and responsibilities of these organizations. 3. Identify the processes, inputs and outputs of each process. 4. Identify the procedural steps for implementing the proposed mechanism.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.04.001
       
  • New cities between sustainability and real estate investment: A case study
           of New Cairo city

    • Authors: Reham M. Hafez
      Pages: 89 - 97
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): Reham M. Hafez
      Urban development differs from one country to another. The various aims and ways differ according to the different economical, social and environmental situations. Many countries followed the policy of establishing new cities in the aim of redistribution of the population or to be as a nucleus that assists in encouraging the economic activity of a certain region or to be a new capital. Egypt has adopted the policy of establishing the new cities for national aims. Many cities were being developed according to development stages, from the first generation, the second generation to the third generation. New Cairo is one of the second generation cities. It is characterized by its distinctive developed location. It has been developed as a result of the economy and investment politics of the Egyptian government at this time, which made it the focus of real estate investment. However, this resulted in negative influences on the sustainability. That is made clear in the different stages of developing the city, – before laying the general comprehensive plan, during preparing the plan and the successive stages of development till now. This research reviews the basis of development of the new cities. The influence of the real estate investment in some Arab countries, then it handles the case study – “New Cairo city”. Discussing all the investing factors made the city in its current status. Then comes the recommendations in a trial to get an alternative structure to achieve sustainability in light of the current determinants and growth stages.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.03.001
       
  • Performance appraisal of the A2/O process in domestic wastewater treatment
           replacing the anaerobic unit with UASB

    • Authors: M.A. Moharram; H.S. Abdelhalim; E.H. Rozaik
      Pages: 98 - 105
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): M.A. Moharram, H.S. Abdelhalim, E.H. Rozaik
      Feasibility of a combined system consisting of an anaerobic up-flow anaerobic sludge blanket (UASB) followed by anoxic unit then aerobic activated sludge (AS) was investigated. The system was fed with normal domestic wastewater, then medium loading wastewater using activated sludge from El Berka WWTP, then high strength sewage having a chemical oxygen demand (COD) of 2635mg COD/L. The organic loading rate (OLR) was increased gradually from 0.5 to 4.43kg COD/m3/day. The HRT was changed for each loading from 10.5 to 15h. The internal recirculation (IR) was tested at 100%, 200% and 300% for each loading run. The return activated sludge was adjusted to maintain a mixed liquor suspended solids of greater than 2500ppm. At steady state conditions, the UASB reactor achieved removal efficiency up to 79.13% of the total COD. The combined system performed an excellent organic removal pushing the overall removal efficiency of the total COD, TN and TP to 95.87%, 84.95% and 87.59%, respectively. When the OLR increased to 4.43kg COD/m3/day, the effluent quality of the UASB deteriorated reaching a percent of 48.20 for COD removal efficiency dropped to 62.90%, 29.90% and 46.90% respectively. The optimum operational conditions for the system on different organic loadings were HRT=15h and the IR=200%.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2015.01.004
       
  • Biosorption of manganese from groundwater by biomass of Saccharomyces
           cerevisiae

    • Authors: M. Fadel; Naziha M. Hassanein; Maha M. Elshafei; Amr H. Mostafa; Marwy A. Ahmed; Hend M. Khater
      Pages: 106 - 113
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): M. Fadel, Naziha M. Hassanein, Maha M. Elshafei, Amr H. Mostafa, Marwy A. Ahmed, Hend M. Khater
      Heavy metal pollution has become one of the most serious environmental problems today. Biological methods such as biosorption or bioaccumulation strategies for the removal of metals ions may provide an attractive alternative to existing technologies. Microorganisms, as heavy metal bioadsorbents, offer a new alternative for removal of toxic or valuable metals in water. Saccharomyces cerevisiae has received increasing attention due to its unique nature and capacity for metal sorption. It is one of the most promising biosorbents capable of removing metal ions from aqueous solution. Manganese occurs naturally in many surface water and groundwater sources and in soils that may erode into this water. Eleven S. cerevisiae yeast strains in alive and dead forms were screened for biosorption and bioaccumulation of manganese from artificial aqueous solution. S. cerevisiae F-25 in alive form was found to be highly biosorbent for Mn+2 and biosorbed 22.5mg Mn+2/gm yeast biomass. Optimization of environmental conditions reveals that optimum concentrations for maximum Mn2+ biosorption by S. cerevisiae F-25 in alive form were 4.8mg Mn2+/l after 30min at pH 7, agitation 150rpm and yeast biomass concentration 0.1gm/l at 30°C. Competition of Mn+2 with other heavy metals shows that Mn+2 in control sample without, any other heavy metals added in solution at 4.8mg/l of the biosorbed Mn+2 was 41.3mg/g biomass. Addition of other heavy metals affects the percent of biosorbed Mn+2.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2014.12.006
       
  • Hydration characteristics and compressive strength of hardened cement
           pastes containing nano-metakaolin

    • Authors: S.M.A. El-Gamal; M.S. Amin; M. Ramadan
      Pages: 114 - 121
      Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1
      Author(s): S.M.A. El-Gamal, M.S. Amin, M. Ramadan
      In this study the effect of inclusion of nano-metakaolin (NMK) to ordinary Portland cement (OPC) on the hydration characteristics and microstructure of hardened OPC–NMK pastes was studied. The OPC–NMK blends were prepared by the partial substitution of OPC by NMK (4, 6, 10 and 15 weight %). The fresh pastes were made using an initial water/solid (W/S) ratio of 0.27 by weight and then hydrated for various time intervals. At the end of each hydration time, the hardened blended cement pastes were tested for compressive strength, free lime content, combined water content, X-ray diffraction (XRD) analysis, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The compressive strength results revealed that the inclusion of nano-metakaolin into OPC improved the mechanical properties of NMK–OPC pastes during almost all ages of hydration, especially with the paste containing 10 wt% NMK. The compressive strength values obtained for OPC paste blended with 4% silica fume (SF) and 6% NMK are comparable to those of the neat OPC paste. The DSC thermograms and XRD diffractograms obtained for some selected hardened pastes indicated the formation of amorphous calcium silicate hydrates, calcium sulfoaluminate hydrates, calcium aluminate hydrate and calcium hydroxide. SEM micrographs showed the formation of a dense microstructure for the hardened OPC–NMK and OPC–NMK-SF pastes as compared to the neat OPC paste after 90days of hydration.

      PubDate: 2017-04-11T12:52:08Z
      DOI: 10.1016/j.hbrcj.2014.11.008
       
  • Enhancement of punching shear strength of flat slabs using shear-band
           reinforcement

    • Authors: Nasr Z. Hassan; Mostafa A. Osman; Awad M. El-Hashimy; Heba K. Tantawy
      Abstract: Publication date: Available online 12 December 2017
      Source:HBRC Journal
      Author(s): Nasr Z. Hassan, Mostafa A. Osman, Awad M. El-Hashimy, Heba K. Tantawy
      Flat-slab system is widely used nowadays. Major and critical problem of this system is its sudden brittle failure is called punching shear failure. To overcome the punching failure problem, there are many ways to increase the punching shear strength of concrete slabs, increasing slab thickness in the area adjacent to the column, increasing column thickness which is against the architectural desire, and finally providing slab with shear reinforcement. Shear reinforcement is more advanced from both the structural and economical point of view. An experimental program includes seven full scale square flat slab interior column specimens tested under gravity loads. All slabs have same dimensions of 1700 mm × 1700 mm with thickness 160 mm and reinforcement ratio of 1.2%. Column was square of 200 mm length and 250 mm height. Elongated steel strips of 25 mm width and 1.5 mm thickness undulated into the slab in different ways to investigate punching shear resistance. The program is divided into five groups. First group investigates the effect of installing the shear-band reinforcement (hanged up on top mesh, knit the top and bottom mesh together). The second group investigates the effect of inclination of shear reinforcement (shear band with vertical leg, with bended leg 45°). The third group investigates the effect of concentrating the shear reinforcement by increasing the quantity around the column. The fourth group investigates effect of radial distribution of shear-band system around the column. Finally, the fifth group investigates the effect of box distribution of shear-band system around the column.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2017.11.003
       
  • Using artificial neural networks (ANN) in projects monitoring
           dashboards’ formulation

    • Authors: Amr Mossalam; Mohamad Arafa
      Abstract: Publication date: Available online 9 December 2017
      Source:HBRC Journal
      Author(s): Amr Mossalam, Mohamad Arafa
      It has been reported via several researches that the sponsorship involvement is a major factor influencing project success. These projects which may vary in their benefits, types, sizes, and complexity levels; generate some sort of difficulty for many government organizations managing hundreds of projects in selecting projects to be monitored. The initial selection of those projects which are being monitored through organization’s dashboards is usually drafted via some criteria that comprise a meaningful group (s) to the top management; and then this selection is altered by forcing few projects in and out. This study aim is to replace the initial existing manual selection process by an intelligent model. The proposed model is based on ANN (Artificial Neural Networks) that uses the databases of more than 300 projects out of which are 48 projects that were actually selected to be in the top management monitoring dashboards. The ANN model was built and tested for accuracy via examining the deviation between the model results and the actual selection. The test results showed acceptable confidence level in the model results where accuracy was proven to be initially accepted. The ANN model is expected to evolve and gains more maturity by including more projects that will be introduced in the coming years plans.

      PubDate: 2017-12-27T01:12:04Z
      DOI: 10.1016/j.hbrcj.2017.11.002
       
  • Inside Front Cover

    • Abstract: Publication date: December 2017
      Source:HBRC Journal, Volume 13, Issue 3


      PubDate: 2017-12-27T01:12:04Z
       
  • Application of electrical resistivity measurement as quality control test
           for calcareous soil

    • Authors: Marwa Mostafa; Mona B. Anwar; Amr Radwan
      Abstract: Publication date: Available online 10 August 2017
      Source:HBRC Journal
      Author(s): Marwa Mostafa, Mona B. Anwar, Amr Radwan
      Soil properties determination for some applications requires quick, easy and cheap method rather than using the traditional sophisticated, time consuming and expensive laboratory test methods. The use of non-disturbing test method is very much recommended to have more reliable test results. Recently, there has been a great demand towards using special techniques and apparatuses for measuring the soil properties in-situ which facilitate having more tests and covering larger area in shorter time. The electrical geophysical method is one of these techniques which allow rapid measure for soil electrical properties such as electrical resistivity, electrical conductivity and potential directly from soil surface to any depth without soil disturbance. In this research, laboratory tests were carried out on calcareous soil samples for determining their electrical resistivity after compaction. Samples were extracted from the soil formation in Ain Helwan inside Helwan University campus. Soil formation in Ain Helwan is different than the usual Nile formation in Cairo or the desert formation near to Helwan area, as it has calcareous nature. Results between electrical resistivity and compaction index were plotted and relationships were developed for soil in this site between electrical resistivity and different soil properties, water content and compaction index. The effect of fine contents on results was also discussed. Based on the obtained results it was found that the change in water content and fines content are reflected on the obtained electrical resistivity and accordingly an in-situ compaction control can be carried out by applying the electrical resistivity approach.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2017.07.001
       
  • Fluidity evaluation of fiber reinforced-self compacting concrete based on
           buoyancy law

    • Authors: Metwally A.A. Abd Elaty; Mariam F. Ghazy
      Abstract: Publication date: Available online 8 August 2017
      Source:HBRC Journal
      Author(s): Metwally A.A. Abd Elaty, Mariam F. Ghazy
      An experimental testing program was undertaken to evaluate the applicability of using the principles of Archimedes' law for buoyancy to assess the fluidity of self compacting concrete (SCC) as well as fiber reinforced self compacting concrete mixes (FR-SCC). A cone instrument with different apex angle values (20, 30, 40 and 45°) was implemented. One type of steel fibers (SF), three types of polypropylene fibers (PP1, PP2 and PP3) as well as one type of glass fibers (GF) with different fiber volume fractions and aspect ratios were conducted. Fourteen FR-SCC mixes in addition to a control mix were examined. A new terminology called fluidity index (FI) was proposed and evaluated based on the displaced volume rate according to the buoyancy law through performing cone penetration test. Parallel with the penetration test, traditional flow ability and segregation resistance tests were performed. The results indicated that the proposed method is effective in evaluating the fluidity of FR-SCC mixes in terms of FI. FI values between 0.8 and 1.0 indicate SCC mixes whereas, FI lower than 0.8 indicate fresh concrete with fluidity not satisfying requirements of SCC. The proposed method can be performed either at laboratory or at field with and without sampling. Moreover, it can be directly adapted to the cast concrete in structural members provided that there is no obstruction for penetration. The direct proportion between FI and the slump flow test results indicated its viability to evaluate the fluidity of both FR-SCC and SCC mixtures.

      PubDate: 2017-09-02T13:28:12Z
      DOI: 10.1016/j.hbrcj.2017.04.003
       
  • Inside Front Cover

    • Abstract: Publication date: August 2017
      Source:HBRC Journal, Volume 13, Issue 2


      PubDate: 2017-09-02T13:28:12Z
       
  • Science park implementation – A proposal for merging research and
           industry in developing Arab countries

    • Authors: Ashraf Mansour Habib Mansour; Lamis Kanso
      Abstract: Publication date: Available online 3 July 2017
      Source:HBRC Journal
      Author(s): Ashraf Mansour Habib Mansour, Lamis Kanso
      Present economy, expansion, achievements of inventions, demographic distribution and business development of knowledge are the key elements of economic and social development. It looks as close as it is, to conception process; it is the process of creating a new innovation with the role of business needs and technological development. Since 1950, science parks have been developed in the United States of America to bridge the gap between research and Industry. Nowadays a science park is widely spread among developed countries, but not with the same plan, objectives, funds, equipped modalities and outcomes. This paper will discuss Science Park implementation as an approach for merging research and industry in Lebanon which is considered an example of a developing Arab country. It is going to present how this moderately new archetype for business innovation could be implemented. Based on studies and analysis, an overview has been done by applying an ideal approach, plan, program, and site selection. This is according to the international criteria essence with the Middle Eastern status and especially the Lebanese one. The paper showed that the science park in Lebanon should be approached and financed by universities rather than the government. Furthermore, it highlights the criteria for its implementation and proposed the appropriate site.

      PubDate: 2017-07-12T11:22:10Z
      DOI: 10.1016/j.hbrcj.2017.06.002
       
  • Heritage conservation ideologies analysis – Historic urban Landscape
           approach for a Mediterranean historic city case study

    • Authors: Hoda Zeayter; Ashraf Mansour Habib Mansour
      Abstract: Publication date: Available online 19 June 2017
      Source:HBRC Journal
      Author(s): Hoda Zeayter, Ashraf Mansour Habib Mansour
      This paper highlights the different ideologies in the history of the conservation movement. It shows a long progress of theories implied through history since it started in early classical ages until the modern globalisation era, and highlights certain points as optimistic strategy to be applied in the conservation of historic city. The ideologies' reviews both the material-based approaches in conservation applied in the beginning of the conservation movement in Europe and the later values-based approaches developed internationally. After reviewing history of ideologies, the methodology used in this paper is carrying an evaluation for the contemporary approaches – in the first part of the research – by analysing them according to three factors: selectivity, authenticity/integrity and sustainability, in order to find the optimum ideology that counters the challenges of the 21st century in historic city's cores. As a result of the analysis carried out, the Historic Urban Landscape approach was verified to be that optimum ideology. The application will be in the form of recommendations that address each step considered by the theory. The second part of the paper focuses on The Historic Urban Landscape Approach, and it includes its application specifically on a Mediterranean historic city (the old city of Tyre-Lebanon) and favours it as the optimum conservation ideology. The research aims to validate the progress in the conservation approaches by examining its historic evolution. The evaluation of the actual approaches in conservation projects demonstrates the positivism of the communal ideology to sustain these projects.

      PubDate: 2017-06-22T05:49:44Z
      DOI: 10.1016/j.hbrcj.2017.06.001
       
  • On the durability of Portland limestone cement: Effect of pH on the
           thaumasite formation

    • Authors: Hanaa Y. Ghorab; Fouad S. Zahran; Mohamed Kamal; Amr Said Meawad
      Abstract: Publication date: Available online 4 May 2017
      Source:HBRC Journal
      Author(s): Hanaa Y. Ghorab, Fouad S. Zahran, Mohamed Kamal, Amr Said Meawad
      The mechanism of thaumasite formation is studied in a solution of sodium silicate and ettringite stored for 12months at 7°C. After 7months, the mix was carbonated by bubbling CO2 gas and the pH decreased from 11 to 9.5; at the 9th month the pH was raised again to 12.5 by adding lime water. The phases formed at the different pH ranges were identified by means of X-ray diffraction and infrared spectroscopy. The results indicate that a certain reaction occurred in the mix stored for 7months at pH 11: A shoulder appeared at frequency of 1030cm−1 in the infrared spectrogram of the mix and the band in the frequency region ∼500–400cm−1 broadened; the X-ray patterns show, however, unchanged ettringite patterns with weak calcite phase. The ettringite phase disappears by lowering the pH to 9.5, and an amorphous phase forms instead. Diffraction lines of aragonite and calcite are identified in this sample, and its IR spectra indicate the transformation of the shoulder at 1030cm−1 to a strong broad band at 1027cm−1 and the appearance of infrared frequencies characteristic of the carbonate phases. The amorphous phase formed is a carbonated complex of hydrated silicate and of decomposed ettringite. It converts to thaumasite with the supply of lime and the rise of pH to 12.5.

      PubDate: 2017-05-08T12:56:08Z
      DOI: 10.1016/j.hbrcj.2017.04.002
       
  • A model for prioritizing concrete structures repair works

    • Authors: Said Abdel Hamid; Ahmed Nouh; Nael Y. Zabel
      Abstract: Publication date: Available online 4 May 2017
      Source:HBRC Journal
      Author(s): Said Abdel Hamid, Ahmed Nouh, Nael Y. Zabel
      The reinforced concrete assets such as bridges, tunnels, administration buildings, schools and the residential buildings are important factors in the Egyptian economy. Several researches have been made in the field of concrete defects and methods of repair. Concrete can deteriorate for a variety of reasons such as the corrosion of steel bars, design errors, construction errors and the environmental conditions. Concrete structures’ deterioration is often the result of a combination of deterioration factors. Factors that contribute to the deterioration of the reinforced concrete structures can be classified into five categories as follows: (1) Design factors such as the code requirements, the structural system, and the foundation design; (2) construction factors such as the mix design and the quality control; (3) protection factors such as the thermal insulation and the water proofing; (4) material factors such as the aggregate and the cement; and (5) the applied loads factors such as the chemicals and the earthquakes. This paper provides a model for prioritizing the concrete structures’ repair works. Past researches have been reviewed to gather the main factors that contribute to the deterioration of concrete structures. Interviews with senior engineers have been conducted during the development of the proposed model. A numerical example has been presented to demonstrate the proposed model.

      PubDate: 2017-05-08T12:56:08Z
      DOI: 10.1016/j.hbrcj.2017.04.001
       
  • Inside Front Cover

    • Abstract: Publication date: April 2017
      Source:HBRC Journal, Volume 13, Issue 1


      PubDate: 2017-04-11T12:52:08Z
       
 
 
JournalTOCs
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