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 structural behavior of reinforced hollow core slab (HCS) by using recycled lightweight material. Six hollow core slab specimens were casted with dimensions 1200mm length, 450mm width and different thickness (200mm, 250mm and 325mm). The shear reinforcement was used for each thickness to resist the shear failure that occur in 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 a get lightweight concrete. The hollow core slab specimens were tested with age 28-day. The test was done by applied two line load up to failure. The experimental results showed an increase in the shear strength up to 50% and 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 increase in the maximum deflection up to 50% with using shear reinforcement compare with hollow core slab specimens without shear reinforcement. From the experimental results of this investigation can be avoid the shear failure and change the mode of failure from the shear to flexural failure.