ABSTRACT
The issue of rutting on asphalt pavement has always been a hot topic in road engineering. China’s road maintenance generates a large amount of waste asphalt mixtures, and the recycling of asphalt pavement is the main measure to consume waste materials.This paper investigates the feasibility of partial replacement of anti-rutting agent in the selected asphalt mixtures with recycled asphalt pavement material (RAP) using lab-based experiments. Results demonstrate that asphalt rutting performance increases as part of the anti-rutting agent are replaced by the RAP. RAP can effectively strengthen the Marshall stability of the selected AC-13 and AC-20 containing anti-rutting agents in both dry and soaked situations. RAP increases the splitting strengths of the selected AC-13 and AC-20 containing anti-rutting agents free of and exposed to the freeze-thaw process. The splitting residual strengths of these specimens after freeze-thaw treatment is over 80%. As the increase of RAP content, the extreme strains of the selected AC-13 and AC-20 in the low-temperature trabecular bending test decrease. 30% of RAP content yields an unqualified asphalt mixture containing an anti-rutting agent in terms of its low-temperature performance. Both the fatigue performances of the selected AC-13 and AC-20 decline with the increase of RAP content. When the RAP content is less than 20%, the fatigue life of the asphalt mixture containing an anti-rutting agent declines slightly, but it shortens significantly as the RAP content increases to 30% or more.
