Replacement of Fine Aggregate with Crumb Rubber

The use of crumb rubber as a replacement for fine aggregates in concrete has gained attention due to the environmental and economic benefits it offers, particularly in reducing waste from used tires. This study investigates the effects of replacing fine aggregates with varying percentages of crumb rubber (5%, 7% and 9%) on the properties of concrete. Concrete mixes were prepared, and their workability, compressive strength, and durability characteristics were tested. The results indicated a decrease in compressive strength as the percentage of crumb rubber increased, due to the lower density and weaker bonding between crumb rubber particles and cement paste. However, the incorporation of crumb rubber improved the concrete's flexibility and impact resistance, making it a potential candidate for specific applications such as pavement construction and non-structural elements. The study also highlights the environmental benefits of reusing crumb rubber, contributing to waste management and promoting sustainability in the construction industry. Further research is recommended to optimize the mix designs and explore the long-term performance of crumb rubber concrete in various environmental conditions.