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Journal Cover American Journal of Civil Engineering and Architecture
  [30 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2328-398X - ISSN (Online) 2328-3998
   Published by Science and Education Publishing Homepage  [72 journals]
  • Study of the Stability and Modeling by Finite Elements Using Plaxis 7.2©
           and Geoslope© of the Ramps A and J of the Toll Motorway at the site of
           “Patte d’oie” (Dakar-Senegal)

    • Authors: Oustasse Abdoulaye SALL; Makhaly BA, Déthié SARR
      Pages: 124 - 135
      Abstract: This article focuses on the study of stability of embankments by finite element method of the straps A and J of the toll road of Dakar-Diamniadio on the section Malick SY-“Patte d’oie”. At the ramp A, deformations have amplitude of 301.93mm. Along AA’, the horizontal deformations are 222.5mm. This leads us to say that the deformations at this ramp are very important especially as allowable deformations in these kinds of structures are very small. Such deformations are larger in the horizontal direction of the embankment. The study shows that at the junction J, deformations are smaller and reach 91.99mm. The horizontal deflections according to section AA’ also show significant deformation equal to 87.63mm. This leads us to say like the above that these deformations are very important especially as these types of structures must withstand long so there have no impact at the road. The study of the stability on Géoslope of the straps A and J of the toll highway has allowed us to demonstrate and reinforce the idea that the slip lines are circular.
      PubDate: 2017-8-17
      DOI: 10.12691/ajcea-5-4-1
      Issue No: Vol. 5, No. 4 (2017)
       
  • Building a New Urban Highway or Elevating an Old One' Finding Optimum
           Solution Based on Environmental Impacts

    • Authors: Rahil Farhani; Seyed Navid Mashhadi Moghadam, Maryam Shoaei Zangir
      Pages: 136 - 153
      Abstract: For a sustainable urban expressway development, it is necessary to conduct an EIA (Environmental Impact Assessment) study. Expressway development and operation should, therefore, be planned with careful consideration of the environmental impacts. An assessment of an expressway project may include consideration of different routes as distinct alternatives. Thus, evaluating alternatives is an important step of environmental impact assessment. In this paper, some MCDM (Multi Criteria Decision Making) models, were used for assessing alternatives in EIA in earlier studies, reviewed and a hybrid MCDM model proposed to tackle the dependency relations of evaluation criteria with aid of the fuzzy DEMATEL (decision-making trial and evaluation laboratory) method. In next step, the fuzzy DEMATEL method combined with ANP (Analytic Network Process) method to weighting criteria for assessment of alternatives with aid of the fuzzy VIKOR (VIseKriterijumska Optimizacija I Kompromisno Resenje) method. Empirical study results illustrate the proposed model is a workable and reliable tool for evaluating alternatives of environmental impact assessment of urban expressway in order to make results much closer to reality.
      PubDate: 2017-9-12
      DOI: 10.12691/ajcea-5-4-2
      Issue No: Vol. 5, No. 4 (2017)
       
  • Using Eccentrically Sample to Find the Relationship between Resistivity
           and Cracking Time in Cement Paste Vides Mechanical Strength and Electrical
           Resistivity

    • Authors: Maha. A. Abusogi; WEI Xiaosheng, Fu lei
      Pages: 154 - 159
      Abstract: Early-age cracking is often attributed as a major cause of reduction in the durability of concrete structures. The objective of this paper is to study the hydration behavior of various samples of different water-cement ratios, that’s in order to assess crack potential, compressive strength and setting time of the cement paste. The behavior of hydration was monitored by using a non-contact electrical resistivity apparatus. While a new eccentrically steel cracking frame (ESCF), setting time and compressive strength standard test were considered to measure the restrained shrinkage cracks, compressive strength and setting time respectively. The objective of using the eccentrically sample is to provide a new method to assess the cracks at early age by presents a complicated and non-uniform circumferential stress in the eccentrically cement paste ring. The results show that the electrical resistivity measurement of all samples with different water cement ratios had similar trends. Whereas the lowest water-cement ratio paste indicates highest resistivity values, reaches an earlier inflection point, and obtained higher compressive strength than other cement pastes of higher water-cement ratio. The eccentrically restrained cracking test (ERCT) and setting time demonstrated that lower water-cement ratio paste set and cracked earliest, which is therefore, confirmed its highest cracking tendency. The cracks took place at the narrow regions of specimens, which can be an indicator for eccentrically restrained shrinkage test (ERST). The cracks were observed as growing at narrow areas and reach full-depth over time. A mathematical model for predicting the cracking age of cement is proposed. The equation showed the existence of a positive relationship between electrical resistivity represented by inflection points (Ti) and cracks time (Tc).
      PubDate: 2017-9-23
      DOI: 10.12691/ajcea-5-4-3
      Issue No: Vol. 5, No. 4 (2017)
       
  • The State of Solid Waste Management in Port Harcourt City, Nigeria

    • Authors: Timiebi Rueben Binafeigha; Anthony Enwin
      Pages: 160 - 166
      Abstract: Although waste management is thought to be the organized and systematic channeling of waste through pathways to ensure that they are disposed of with attention to acceptable public health and environmental safeguards. Wastes management in Port Harcourt is far from the above definition as there are no proper techniques in place to ensure the orderly executions of the basic principles of waste management. Hence, garbage often litters the streets in some suburbs of the city. This paper examines the current waste management practice in Port Harcourt through personal observation and research materials from previous publications. It was found that, wastes are often burned or disposed of on landfills, open dumps and water bodies without prior treatment. The paper concluded by giving some recommendations which could improve the waste management situation of the city.
      PubDate: 2017-10-7
      DOI: 10.12691/ajcea-5-4-4
      Issue No: Vol. 5, No. 4 (2017)
       
  • Indoor Environmental Quality in Air-conditioned Mosque Buildings in Kuwait

    • Authors: Farraj F. Al-ajmi; Ali. S. Al-azmi, Fawaz A. Alrashidi
      Pages: 167 - 173
      Abstract: In this study, the indoor environmental quality (IEQ) of air-conditioned mosque buildings in an extremely dry desert climate is examined from the perspective of the occupants via two aspects: thermal comfort and indoor air quality. The study presents statistical data about the worshiper thermal comfort together with data describing the indoor air quality in Kuwaiti mosque buildings. With respect to the latter, the overall IEQ acceptance using two measurements, namely, physical measurements and subjective information collected via questionnaires, was used to evaluate 140 worshipers visiting six air-conditioned mosque buildings in the state of Kuwait. The operative temperature based on actual mean vote (AMV) and predicted mean vote (PMV) was identified using a linear regression analysis of the responses on the ASHRAE seven-point thermal sensation scale and was found to be 26.1°C in the summer season .The indoor air quality (IAQ) with respect to the carbon dioxide concentration levels was compared with the acceptable limits of international standards, i.e., the ASHRAE Standard 62.1 [1]. The proposed overall IEQ acceptance findings in the mosque buildings show CO2 concentrations between 730 and 1220 ppm. However, this is considered a slightly higher than the ideal CO2 concentrations, which may require increasing ventilation rates by opening windows and, doors or by mechanical ventilation.
      PubDate: 2017-10-8
      DOI: 10.12691/ajcea-5-4-5
      Issue No: Vol. 5, No. 4 (2017)
       
 
 
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