IMPROVING SHEAR STRENGTH OF THICK HOLLOW CORE SLABS BY USING LIGHTWEIGHT HIGH STRENGTH CONCRETE PRODUCED FROM RECYCLED CRUSHED CLAY BRICK AND IRON POWDER WASTE

Abstract

This investigation provides an experimental study about the structural behavior of reinforced hollow core slabs (HCS)by using recycled lightweight material. Sixhollow core slab specimens were cast with dimensions 1200mm length, 450mm width and different thicknesses (200mm, 250mm and 325mm). The shear reinforcement was used for each thickness to resist the shear failure that occur in the thick hollow core slab. The Recycled materials were crushed clay brick and iron powder waste. The crushed clay brick was used as a coarse aggregate instead of gravel to get lightweight concrete. The hollow core slab specimens were tested with age 28-day. The test was done by applying two-line loads up to failure. The experimental results showed an increase in the shear strength up to 50% and a decrease in the maximum deflection up to 50% with increasing thickness specimen. Also, the experimental results showed an increase in the shear strength up to 50% and an increase in the maximum deflection up to 50% with using shear reinforcement compare with hollow core slab specimens without shear reinforcement. The experimental results of this investigation can avoid the shear failure and change the mode of failure from the shear to flexural failure