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Journal of Building Materials and Structures
Number of Followers: 2

This is an Open Access Journal

Open Access journal
ISSN (Print) 2353-0057 - ISSN (Online) 2600-6936
Published by OASIS Publications

[1 journal]

Pozzolanic Properties of White Cowpea Husk Ash
- Authors: Uwemedimo Nyong Wilson, Gambo Z, Mohammed I S , Eze O C, Odeyemi S O
  Pages: 93 - 102
  Abstract: This research attempts to empirically investigate the pozzolanic properties of White Cowpea Husk Ash (WCHA), an agricultural biomass waste, at different percentages of its use as partial replacement of cement in concrete. WCHA was obtained after the calcination of white cowpea husk for 3 hours at 5500C. X-ray Florescence (XRF) analysis performed revealed that the sample of WCHA is a Class C pozzolana, which contains 65.4% of the combination of SiO2, Al2O3, and Fe2O3. The WCHA shows increase in consistency with increase in the WCHA content. This was attributed to the high Loss of Ignition (LOI) of WCHA compared to that of the cement. In addition, the results indicated that the initial and final setting time of WCHA – Cement blended concrete increase with increase in the WCHA content. The delay in setting times of WCPA-Cement paste could be attributable to the slower pozzolanic reaction. The density of the concrete decreased as the WCHA content increases. Generally the compressive strength of the WCHA concrete increased with increase in curing age and decreases as the WCHA content increased from a strength of 28.6 to 20.0 N/mm2 giving a percentage reduction of 30.1 %. The strength reduction is also attributed to the modification of the bonding properties of the binders’ hydrates. However, the 28 days compressive strength of concrete with up to 10 % WCHA content (26.4 N/mm2) satisfied the design characteristic strength of 25 N/mm2. Beyond this limit, the compressive strength of the concrete fell below the design strength. Hence, 10 % WCHA could be regarded as the optimum dose for grade 25 concrete.
  PubDate: 2021-12-31
  DOI: 10.34118/jbms.v8i2.1375
  Issue No: Vol. 8, No. 2 (2021)
Empirical Equation for Concrete Made With PPC or OPC with Fly Ash by
Accelerated Mix Design Method
- Authors: P N Ojha, Suresh Kumar, Manish Kumar Mandre, Piyush Mittal, Brijesh Singh, Arora V V
  Pages: 103 - 114
  Abstract: Assessment of 28 days strength from accelerated strength (1 day) can be extremely helpful. Early prediction of 28 days compressive strength is required basically for two purposes. First, to finalize the concrete mix proportions in the laboratory and secondly, for quality control purpose during construction. Through this concept designers can easily identify the uncalculated errors during mix design or variations in materials and exposure conditions etc. and take necessary correction and modification measures to attain the desired strengths at 28 days. As per IS: 9013 methodology to predict the 28 days strength of concrete from accelerated cured strength are indicated only for normal/control concrete. In the past few year focus has shifted from Ordinary Portland Cement (OPC) to Portland Pozzolana Cement (PPC). Fly ash is also being used widely at sites as replacement of OPC. However, there is no such guideline available by which the assessment of 28 days strength of Indian fly ash concrete can be made from accelerated strength tests. In the present study an attempt has been made to predict the expected 28 days compressive strength of concrete having PPC or OPC with fly ash using accelerated temperature regime methods. The experimental study includes the use of 2 brands of PPC, 5 brands of OPC and 2 sources of fly ash for replacement of OPC ranging from 20% to 45 %. Two temperature regimes 900C and 820C were used for accelerated curing. The samples were cured for 7.5 hours and 20hours respectively in each regime for expected 28 day compressive strength. The mathematical equations to estimate the 28 days compressive strength of concrete, cured at 900C for 7.5 hours for mixes having PPC, OPC mixed with fly ash 20% to 35% is fexp28 = 1.223 facs +2.024. The mathematical equations to estimate the 28 days compressive strength of concrete, cured at 900C for 7.5 hours for mixes having PPC, OPC mixed with fly ash more than 35% and up to 45% is fexp28 = 0.993 facs + 6.044.
  PubDate: 2021-12-31
  DOI: 10.34118/jbms.v8i2.1487
  Issue No: Vol. 8, No. 2 (2021)
The High-Speed Railway Bridges Under Vehicle Moving Load And Near Fault
Seismic Ground Motions – Review.
- Authors: Amudhan Vijayakumar, Hui Qian
  Pages: 115 - 127
  Abstract: All-time needs of maintenance of high-speed train system and its infrastructure safety are must all over the world. Nowadays, for the smooth running of HSR trains, most of the country depends on the HSR bridge structures, but there is still a lack of understanding of the behavior of structures under various factors like seismic and high speed moving load effects. To study the dynamic behavior of HSR bridges, it is important to consider the interaction of moving vehicle – Bridge structure – Ground surface showing that the different parameters involved in understanding the response of the structure. The main motivation of this study is to initiate a better understanding of the various parameters effects by those seismic and moving vehicles over the dynamic behavior of the HSR bridges. The effects of forwarding directivity pulses were considered to understand the behavior of HSR bridges against near-fault earthquakes, which can make a substantial impact on the seismic demand capacity of the moving vehicles and structures. The effects of high-speed moving vehicles over the HSR bridges to understanding the parameters involved in the dynamic behavior of the coupled system. This literature review can help the beginners and who initiate the study based on the dynamic behavior of high-speed railway bridges and their components under seismic and moving load effects.
  PubDate: 2021-12-31
  DOI: 10.34118/jbms.v8i2.1288
  Issue No: Vol. 8, No. 2 (2021)
ANN modelling approach for predicting SCC properties - Research
considering Algerian experience. Part III. Effect of mineral admixtures
- Authors: Mohamed Sahraoui, Tayeb Bouziani
  Pages: 128 - 138
  Abstract: This paper addresses the effect of mineral admixtures on fresh and hardened properties of self compacting concrete (SCC). Artificial neural networks (ANN) and simplex lattice design approach was integrated to predict and evaluate the effect of limestone, marble powder, natural pozzolan and slag on rheological and mechanical properties of SCC evaluated by slump flow, L-Box, V-funnel, sieve segregation test and 28 days compressive strength. The modelling results show an acceptable prediction accuracy of SCC behaviour containing mineral admixtures as substitution of cement especially related to the flow time measured with the V-funnel test and mechanical compressive strength at 28 days.
  PubDate: 2021-12-31
  DOI: 10.34118/jbms.v8i2.1080
  Issue No: Vol. 8, No. 2 (2021)
Mechanical characteristics of compressed earth blocks, compressed
stabilized earth blocks and stabilized adobe bricks with cement in the
town of Ngaoundere - Cameroon
- Authors: Janvier Goutsaya, Guy Edgar NTAMACK, Bienvenu Kenmeugne, Saâd Charif d’Ouazzane
  Pages: 139 - 159
  Abstract: The aim of this study is to examine the effects of cement stabilization on the mechanical stress of compressed stabilized earth blocks (CSEBs) and adobe stabilized earth bricks (ASEBs). Hence, this work is based on an experimental study carried out in order to determine the geotechnical properties of the samples soil, namely, the dry particle size analysis after washing, the particle size distribution by sedimentometry, Atterberg limits, and the preparation of specimens with different levels of cement proportions. Moreover, single compression and three-point bending compression out on specimens measuring 4x4x4cm3 and 4x4x16cm3 respectively. The findings indicate that dosing with 8% cement results in a clear increase in compression stress of approximately 25.55% for CSEBs compared to the reference set at 0% and 22.85% for ASEBs. On the other hand, for a dosage of 4%, we observe a slight increase in stress by simple compression of around 3.26% for CSEBs and 3.14% for ASEBs. For three-point bending compression for a cement dosage of 8%, there is also an increase in stress of about 25% for the CSEBs compared to the reference taken at 0% and 23.02% for the ASEBs.
  PubDate: 2021-12-31
  DOI: 10.34118/jbms.v8i2.1441
  Issue No: Vol. 8, No. 2 (2021)
Development of Guinea Corn Husk-Cow Hair Hybrid Fibre Reinforced Cement
Composite
- Authors: Jonathan Alomaja, Alao Jimoh, Uwemedimo Wilson, Oluwatoyin Joseph, Monsuru Akinleye, Joseph Adeleke
  Pages: 160 - 167
  Abstract: This research work presents the application of guinea corn husk (GCH) and cow hair (CH) fibres as reinforcement in cement composite. The influence of the hybrid fibre volume on the flexural performance of the composite has been studied experimentally. The mechanical (flexural strength) and physical (density, water absorptivity, moisture content) characteristics of the GCH-CH hybrid fibre reinforced composite were evaluated. The highest flexural strength was 22.37MPa, exhibited by the composite reinforced with 15% (12.5% GCH & 2.5% CH) hybrid fibre. The density of the GCH-CH hybrid composite ranged from 1019 to 1963 kg/m3. The water absorptivity varied from 22.59 to 38.16% and the moisture content ranged from 3.32 to 11.28%. These limits are within the range in standard therefore, the performance of the composite satisfies the requirements of BS EN 12467 standard for ceiling board.
  PubDate: 2021-12-31
  DOI: 10.34118/jbms.v8i2.1333
  Issue No: Vol. 8, No. 2 (2021)
Impact of ISO: 17020 for Quality Assurance System in Construction Sector
- Authors: Vikas Patel, Brijesh Singh, P N Ojha, Pandu Ranga Rao, Amit Sagar
  Pages: 168 - 178
  Abstract: The objective of the paper is to analyze the various factors and loop holes that have a significant impact on effectiveness of quality and quality assurance system and to suggest recommendations to increase the quality performance of the construction projects. The paper also highlights the difference in Quality Assurance system of projects wherein ISO: 17020 is not implemented and the project wherein it is implemented. In the current paper, National Council for Cement and Building Materials, India monitored 30 construction projects were selected with a construction cost between five to thirty Crores covering 15 project with ISO:17020 procedures and 15 project without ISO:17020 procedures. The data was collected from these projects on various quality and management related aspects. These projects cover structures such as school buildings, community hall, hostel block, convention centers etc. The study was conducted for construction projects of different government bodies. This analysis has been mainly done covering the factors playing key role in quality of a structure during construction such as client’s commitment towards quality, quality of material, documentation, work practices, personnel etc. Based on the data analysis, quality assurance system for these projects were categorized as Excellent, Good, Average and Poor in Quality Grading based on the various factors that directly or indirectly affects the quality and smooth functioning of project during and post construction. The difference in implementation of quality system with and without ISO: 17020 is highlighted in the paper.
  PubDate: 2021-12-31
  DOI: 10.34118/jbms.v8i2.1488
  Issue No: Vol. 8, No. 2 (2021)