Investigation of Crumb Rubber Modification on the Performance of Bitumen and Asphalt Mixtures

Abstract

Abstract The performance of flexible pavements is greatly influenced by rutting, fatigue, and durability. The limitations of traditional bitumen in flexible asphalt pavements are due to the significant rise in traffic loads and volumes. The reason for incorporating tire waste into bitumen is its incredible qualities and economical price as a bitumen modifier. The quality of crumb rubber-modified bitumen (CRMB) mainly depends on the concentration of crumb rubber (CR) dispersed into the base bitumen. The primary target of this research is to modify the bitumen with CR to improve the thermal properties, rheology, rutting resistance, fatigue resistance, and moisture-damaged performance. The three concentrations, i.e., 5%, 10%, and 15% of CR, were prepared by dispersion in conventional 60/70 penetration grade bitumen. The consistency and mixture test results concluded that the optimum dosage of CR-10% provides appropriate thermal, rheological, rut, fatigue, and moisture-damaged performance.