Stability Analysis of Conventional Mix by Crumb Rubber Modified Bitumen

Abstract

The incorporation of recycled Crumb Rubber Modified Bitumen (CRMB) in VG30 and VG40 mix pavements represents a significant step toward promoting sustainable infrastructure while creating new opportunities for global investors. Asphalt modifiers, such as crumb rubber, not only improve the performance of flexible pavements but also contribute to environmental sustainability. Crumb Rubber, derived from End-of-Life Tires (ELTs), has been widely recognized for its ability to enhance the performance of asphalt mixes, particularly in mitigating high-temperature rutting and low-temperature thermal cracking, owing to its unique properties. This paper reviews key findings from previous research, focusing on the process of grinding ELTs to produce CR, the technologies involved, and the evaluation of the physical and mechanical properties of CR-modified asphalt binders. Although this study primarily emphasizes the use of Hot Mix Asphalt (HMA) incorporating CR, it also acknowledges other applications such as Warm Mix Asphalt (WMA), Reclaimed Asphalt Pavement (RAP), and Porous Asphalt, where CR has been effectively used either as a modifier or additive. A comprehensive review of the literature indicates that crumb rubber enhances pavement performance and is particularly suitable for top paving layers, where it helps in reducing traffic noise and offers additional functional benefits.