Influence of coarse aggregate performance on high temperature performance of asphalt mixture

In order to clarify the influence mechanism of property of surface texture and geometry of coarse aggregate on the high temperature performance in the asphalt mixture, and to offer reference for the aggregate production and improve asphalt pavement rutting resistance, combined with the existing research progress of high temperature performance of asphalt mixture, influences of the surface texture, the angularity and the content of flat particle on high temperature performance of the asphalt mixture were analyzed by a large number of laboratory experiments. The results show that there exists a linear relationship between surface texture of coarse aggregate and friction angle and dynamic stability. The larger the surface texture is, the better the dynamic stability is. When average angularity coefficient is larger than 14.5%, dynamic stability of asphalt mixture enhances greatly. The more the content of flat particle is, the worse the high temperature performance is and the content of flat particle shows different influences on high temperature performance of asphalt mixture with various gradations, in which the frame type gradation is the most sensitive to content of flat particle.