ABSTRACT
This study aims to investigate the effect of crumb rubber (CR) content on the mechanical performance of dry-mixed rubberized epoxy asphalt mixtures (DREAM) which were designed to use as railway infrastructure materials. The phase angle tests and damaged tests including the uniaxial compression (UC) and indirect tensile test (IDT, i.e., splitting test) were performed to evaluate the damping ratio and mechanical strength of proposed mixtures. Results indicate that the CR plays an important role to improve the damping characteristic and impair the brittleness of epoxy asphalt mixtures. However, it also will decrease the compression strength and splitting strength of rubberized epoxy asphalt mixtures because of the weak strength of CR. What’s more, the replacement of coarse aggregates with the same size of CR will not cause a significant change in the fracture modes. Considering the damping performance and mechanical strength, the optimal CR content is 4%.
