Evaluation Method of Gradation Segregation of Large Size Asphalt Mixture

The gradation segregation of asphalt mixture is one of the causes of early damage of asphalt pavement; the large size asphalt mixtures have more prone to aggregate segregation due to the coarse aggregate content more than the normal asphalt mixes. This paper developed the measuring instrument of the aggregate segregation of asphalt mix. The different types of asphalt mixes with five gradations had done the gradation segregation test,its reliability was verified. The test results show that large size asphalt mixture using Bailey method design had the strong resistance to segregation characteristics than AC type asphalt mixture; the aggregate pass rate difference between before and after stockbin was suggested to evaluation asphalt mixture gradation segregation.