PUNCHING SHEAR BEHAVIOR OF BUBBLED REINFORCED CONCRETE SLABS
DIYALA JOURNAL OF ENGINEERING SCIENCES,
2016, Volume 9, Issue 1, Pages 55-66
AbstractThis work presents the shear capacities and sustainable analysis of reinforced concrete (RC) two way hollow slabs with plastic sphere voids, also known as bubbled RC slab system. A bubbled RC slab has two-dimensional arrangement of voids included to reduce the self-weight. The strength and behavior of bubbled RC slabs with plastic spheres voids is investigated experimentally. Three RC square slabs of 1000mm x 1000mm dimensions have been tested to obtain the punching shear behavior. Variables of the experimental work are: thickness of reinforced concrete slabs, and volume of concrete. It has been found that bubbled RC slab, (with ratio of bubble diameter B to slab thickness H, B/H= 0.80), has about (92.163 %) of the ultimate load capacity of a similar reference solid slab (which has the same slab thickness). Also, bubbled slabs consume about (74 %) of the concrete needed for the similar solid slab. A small increase in the deflection at 0.7Pu by about (0.718%), at the same time, the cracking load is found to be decreased by about (6.286%) relative to solid slab system. For approximately the same volume of concrete, the bubbled slabs result an increase in the ultimate load capacity of bubbled slab by about (6.4%) and a reduction in the deflection at 0.7Pu by about (1.10%). At the same time, the cracking load is found to be increased by about (10%).
Analysis of the amount of input raw materials, energy consumption, and CO2 emissions for the bubbled RC slabs, showed that there is a reduction in the amount of the input raw materials used such as sand, gravel and cement up to 28% and this leads to a reduction in the cost of these materials. Sustainable analysis gives a fact that the energy consumption and CO2 emission can be reduced by about (12 to 21%), so it can be said that, the use of bubbled RC slabs is very useful in terms of sustainable building and has important contribution to construct the environmentally friendly buildings.
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