Skid resistance of Asphalt Hot-mix Recycling

Abstract

     Recently, the resources for asphalt pavement construction have been decreased. Therefore, the asphalt hot-mix recycling was developed by using the recycled or reclaim asphalt pavement (RAP) as the asphalt concrete aggregates. The literature reviews indicate that the recent researches focused on the performances and strength of asphalt hot-mix recycling, however, there are a few numbers of researches focusing on the safety issues of these materials. Accordingly, this research aims to evaluate the skid resistance of asphalt hot-mix recycling with different amount of RAP in the mixtures. Three types of asphalt concrete were designed according to the Marshall method; (1) the asphalt concrete with 50% of RAP, (2) the asphalt concrete with 100% of RAP, and (3) the asphalt concrete with no RAP. The asphalt binder grade AC60-70 was used as the supplementary binder for every asphalt concrete mixture in this research. The skid resistance of three asphalt mixtures were measured by British Pendulum Tester and Dynamic Friction Tester. The three-wheel polishing device was applied in order to simulate the long-term deterioration for each type of the mixtures. The strength test show that, as increasing amount of RAP, more stability of asphalt concrete mixture, however, less flow of the mixed materials.Moreover, the results show that asphalt concrete with no RAP product the skid resistance value greater than this value of asphalt concrete with 50% and 100% of RAP. This research reveals that the skid resistance of asphalt concrete is relate to the results of Los Angeles Abrasion test, but not for the Polished Stone Value (PSV) test.