Abstract
In recent years, many studies were made on the punching resistance of concrete slab incorporated with reinforcements. In a reinforced concrete slab, the ultimate strength is always governed by its punching shear capacity. Generally this shear capacity is increased by steel reinforcement. In addition to the steel reinforcement, incorporating fibres will enhance its shear capacity thereby increasing the ultimate strength. It is also been justified that application of fibre to increase punching shear capacity will be a viable solution. In this study, a conceptual mix of concrete was arrived based on three phase particle interaction. Based on the packing density evaluation 50% of cement is replaced with slag. This mix is incorporated with hybrid fibres such as polymeric fibres (polypropylene) and non-polymeric fibres (steel) in different aspect ratios. The test results shows that all the hybrid concrete mixes records a better result than the control concrete mix without fibre addition. The periphery and mid deflection is also measured and found to be relatively linear.