Anti-skid durability of porous drainage asphalt mixture based on discrete element

Abstract

In order to improve safety indicators such as the skid resistance and durability of road, the discrete-element method is used to study the proportion of the asphalt mixture, and the spatial structure of the coarse aggregates and asphalt mortar are compared and analysed. Relevant models are established to compare their pendulum values and structural depth attenuation. When the fine aggregate is limestone and the surface polishing times do not exceed 3500 times, the 7/3S1 asphalt mixture has the best pendulum value. However, as the polishing times continue to increase, the mixture ratio also changes. Compared with the 7/3S1 asphalt mixture, the 8/2S1 asphalt mixture has better effect. When the fine aggregate is replaced by limestone, no matter what form the coarse aggregate is, the pendulum value has been improved to a certain extent comparing with the previous mixture. A2S2, 5/5S2, 7/3S2 and 8/2S2 blends, compared with A2A2, 5/5A2, 7/3A2 and 8/2A2 blends, the pendulum value was increased by 1.7, 0.5, 2.3 and 2.1%, respectively. The study shows that in different proportions of coarse aggregates, as the surface texture richness of the blended aggregate increases, the differences between the aggregates also increases, and skid resistance and durability are also enhanced. The research results provide a blending method to increase the skid resistance and durability of asphalt pavement.