The impact of recycled crumb rubber powder on the behavior of the asphalt mixture

Abstract

The increase of automobile tires, which represent a significant environmental hazard, the widespread need to enhance the performance of road pavements, and the transition to a more sustainable transportation system have greatly pushed the use of waste materials in asphalt mixture. The use of tire shreds as a crumb rubber (CR) modifier in asphalt paving materials have shown the potential for vast benefits. Crumb rubber was mixed with asphalt bitumen with 15% of a measure of how much asphalt binder is used to make rubberized asphalt. This research was done to determine how rubberized asphalt affected surface hot mix asphalt's mechanical and volumetric characteristics (HMA). Laboratory tests included the following volumetrics: bulk specific gravity of compacted mixture (Gmb); theoretical mixture specific gravity of loose mixture (Gmm); air voids (A v); voids in mineral aggregate (VMA); and voids filled with asphalt. All asphalt mixes were created using the Marshall mix design method (VF A). Hot-mix asphalt is tested mechanically using the Marshall stability (MS), Marshall flow (MF), and indirect tensile strength (IDTS) tests (HMA). In comparison to the reference mixture, the asphalt mixture's volumetric and mechanical parameters showed a 15% CR improvement in behavior, according to the data. Gmb, Gmm, VFA, MS, and IDTS were raised by, respectively, 0.21 %,0.04 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> , 2.7%, 24%, and 15%. lowered MF by 16%, Av by 5%, and VMA by 1.3% as well. This information improved the qualities of the amended asphalt mix at high and low temperatures and its resistance to rutting and fatigue cracking. Overall, this study helps increase the usage of CR-modified asphalt in constructing high-quality pavement.