An Experimental Study on the Compressive Strength of M20 Grade Concrete by Partial Replacement of Coarse Aggregate with Waste Rubber Tyres

– The disposal of waste rubber tyres poses a serious environmental challenge due to their non-biodegradable nature. This experimental study investigates the effect of partial replacement of coarse aggregate with waste rubber tyre chips on the compressive strength of M20 grade concrete. Coarse aggregate was replaced by rubber tyre chips at proportions of 5%, 10%, and 15% by volume. Concrete cubes were cast and tested for compressive strength after 7 and 28 days of curing in accordance with standard procedures. The results indicate that compressive strength decreases with an increase in rubber content due to the lower stiffness and poor bonding characteristics of rubber particles compared to natural aggregates. However, concrete with 5% rubber replacement exhibited a marginal reduction in compressive strength while still satisfying the strength requirements of M20 grade concrete. At 10% and 15% replacement levels, a significant reduction in compressive strength was observed when compared to conventional concrete. Despite the strength reduction, rubberized concrete showed improved ductility and crack resistance. The study concludes that partial replacement of coarse aggregate with waste rubber tyres up to 5% can be considered for non-structural and sustainable construction applications, contributing to effective waste management and environmental sustainability.