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RISS 인기검색어
- 검색키워드
- 저자 : Balapour, Mohammad (검색결과 2 건)
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Evaluation of incorporating metakaolin to evaluate durability and mechanical properties of concrete
Joshaghani, Alireza,Moeini, Mohammad Amin,Balapour, Mohammad Techno-Press 2017 Advances in concrete construction Vol.5 No.3
Concrete is known to be the most used construction material worldwide. The environmental and economic aspects of Ordinary Portland Cement (OPC) containing concrete have led research studies to investigate the possibility of incorporating supplementary cementitious materials (SCMs) in concrete. Metakaolin (MK) is one SCM with high pozzolanic reactivity generated throughout the thermal activation of high purity kaolinite clay at a temperature ranging from $500^{\circ}C$ to $800^{\circ}C$. Although many studies have evaluated the effect of MK on mechanical properties of concrete and have reported positive effects, limited articles are considering the effect of MK on durability properties of concrete. Considering the lifetime assessment of concrete structures, the durability of concrete has become of particular interest recently. In the present work, the influences of MK on mechanical and durability properties of concrete mixtures are evaluated. Various experiments such as slump flow test, compressive strength, water permeability, freeze and thaw cycles, rapid chloride penetration and surface resistivity tests were carried out to determine mechanical and durability properties of concretes. Concretes made with the incorporation of MK revealed better mechanical and durability properties compared to control concretes due to combined pozzolanic reactivity and the filler effect of MK.
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Optimization of Coupled Shear Walls Openings Dimensions under Static Loading using Continuous Method
Mohammad Vatandoust,Massoud Riyazi,Alireza Joshaghani,Mohammad Balapour 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.12
This paper presents a method for easy calculation of the optimum dimensions of the shear walls openings based on deformation and displacement of the wall in the roof elevation with the usage of the continuous method. By using the continuous method, researchers have tried to calculate the relationship between the displacement of the wall in the roof elevation with the openings dimensions. The displacement diagram of the wall at roof elevation will be plotted with respect to the defined parameters of the openings length to the walls length ratio and the percentage of the openings area to walls area ratio. Then, the openings dimension, which led to minimum displacement, will be chosen, and its alterations diagram versus the walls dimensions will be plotted. The effect of the parameters, such as the number of floors and loading type on the calculated optimum dimensions, which may change the results, has been shown. Two case studies of coupled shear wall under lateral load were considered. In both of them, the openings areas were analyzed with the ETABS program, first with optimal dimensions and then with non-optimal dimensions. The results were compared, and a simple method was presented for the calculation of the optimized dimensions of openings.
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