Performance Characterization of Rubberized Asphalt Mixtures Incorporating Waste Tire and Solid Natural Rubber

The performance of asphalt mixtures modified with 7% and 10% waste tire and solid natural rubber is assessed in this study, along with the effects of replacing fine aggregate with these materials. According to binder testing, a 10% rubber modification improved viscosity and deformation resistance while raising the softening point to 62.25°C. According to Marshall's findings, modified binders needed a higher optimal asphalt content of 6.05% to 6.25%. While the 7% modification produced the highest stability of 23.0 kN, replacing 50% of the river sand with Solid Natural Rubber decreased stability to 6.29 kN, falling short of requirements due to reduced structural rigidity. The 10% rubber mixture showed notable increases in stiffness modulus, increasing by 88.99% at 25°C and 105.69% at 40°C, according to testing. Additionally, the 10% modification achieved the highest durability, with 3,701 cycles, a 9.4% improvement over the control, according to the Indirect Tensile Fatigue Test results. According to the study's findings, rubber modifications of 7% and 10% greatly increase load-bearing capacity and fatigue resistance; however, in order to preserve the pavement's structural stability and integrity, rubber use as a fine aggregate replacement must be strictly limited.