Some Properties of Sustainable Concrete with Rubber Waste Aggregate

The cumulative quantities of non-biodegradable solid tire waste, which are byproducts of transport vehicles, contribute to environmental pollution.. This study seeks to address this issue by investigating the impact of using this waste as a replacement for natural coarse and fine aggregate in varying ratios (10%, 15%, and 20% as coarse aggregate, and 5%, 10%, and 15% as fine aggregate by volume) to create sustainable concrete. All mixtures incorporate 10% silica fume (SF) as a cement replacement by weight. Results reveal decreased workability, fresh density, compressive, and splitting tensile strength with increasing rubber replacement proportions. However, utilizing tire rubber aggregate leads to the production of structural lightweight concrete (LWC), with advantages such as reduced oven dry density. Notably, a 20% replacement of coarse rubber waste and 15% replacement of fine rubber waste yield compressive strengths of 48.80 MPa and an oven-dry density of 1952.5 kg/m3, respectively, classifying these concrete mixes as structural lightweight concrete.