Performance of RC deep beams containing eco-friendly waste PET aggregate: experimental investigation

This study aims to investigate the rheological properties, mechanical strength, and structural behaviour of self-compacting concrete (SCC) deep beams incorporating waste polyethylene terephthalate (PET) as partial replacement of fine and coarse aggregate. The replacement ratios were set at 10% and 20%. The engineering properties of SCC were examined such as slump flow test, slump flow time (T50cm), J-ring test, V-funnel and L-box test, compressive strength, splitting tensile strength, flexural strength. Additionally, the structural behaviour of the beams was assessed based on load-deflection curves, load-strain relationships, and cracking patterns. The results indicate that a replacement ratio of up to 10% has a minimal impact on the reduction of load-bearing capacity of deep beam. Furthermore, visual examinations were performed to determine the mode of failure. It was found that a certain amount of waste plastic can be used in structural applications without compromising the flexural characteristics of reinforced concrete beams.