Improvement of permeable asphalt pavement by adding crumb rubber waste

Abstract

Designing mixtures of asphalt with a porous structure to gain good trainability decreases both the propagation and generation of traffic noise. Porous asphalt (PA)mixtures use crushed stone, a small proportion of processing sand, admixtures, and asphalt binders. Therefore, this study aims to examine the impact of adding crumbed rubber into the mix of PA. However, the optimum amount of the binder used in the reference mixture without crumb rubber (CR) and the mixture with 10, 15, and 20% of crumbed rubber waste was identified by utilizing drain down. The test of Cantabro loss, air voids, and indirect tests of tensile and permeability were performed on samples to identify the influence of adding crumbed rubber on the features of the PA mixes. The optimum asphalt content achieved is 6.3%. The results indicated that CR decreases PA permeability, while the additional amount of crumbed rubber in PA negatively influences PA characteristics.