asphalt mixture;  aggregate segregation;  temperature segregation;  porosity;  Compaction

Taking SUP16 asphalt mixture as an example, the performance analysis and experimental study of asphalt mixture with different segregation conditions in on-site construction were carried out, and the relationship between aggregate segregation and temperature segregation of asphalt mixture and the change of void ratio, as well as the influence of void ratio on the compaction and flatness of asphalt pavement, were analyzed. The results show that the average porosity of coarse aggregate concentrated mixture is 9.5, and the water absorption rate is as high as 2.0, and the effect of coarse aggregate segregation on the performance of asphalt mixture is more serious. The change of porosity is obviously affected by the temperature of the asphalt mixture. The amplitude increases with the decrease in temperature. The deviation between the porosity and the design value increases. The compaction quality and flatness of the pavement deteriorate.