Research On Asphalt Mixture At High Temperature Stability Designed By GTM

With the development of economy and the increasing traffic, the proportion of overload is rising gradually. The functional performance of roadway is faced with challenges especially that the problem of rut at the high temperature is drawn attention, In this research, through a series of experimental studies on the stability of the asphalt mixture at high temperature, the purpose is to find out a reasonable scope of gradation, to research a good many factors impacting the stability of asphalt mixture at high temperature, to desect the cause of formation and developmental rule of rut, so that it can satisfy the development of highway and improve the servicing ability of pavement.Aiming at the problem that we can't design perfect asphalt mixture with actual Marshell, 11 kind of asphalt mixtures were optimized using Gyratory Testing Machine and the grade range resisting high temperture was put forward through rut tests, and we discussed the rule of the passing ratio of key boult 4.75 mm. filler to bituminous ration is a pivotal problem in the design of asphalt mixture, rational filler to bituminous ration can evidently improve resistance to rutting. In this paper, rutting test and Gyratory Testing Machine test are drawn up on asphalt mixture of different filler to bituminous ration, using dynamic shear rheometer and SEM to analyze the microstructure of asphalt mortar, the range of optimal ratio was put forward. The forbidden zone existing difference was proved by experiments and negated the exist of the forbidden zone. We studied the internal relation between the rate of void, voids in the mineral aggregate ,compactness and the stability at high temperature of asphalt mixture and analyzed the effecting factors by the theory of grey relation degree. The cause of formation of the rut and the developmental rule at high temperature of asphalt mixture were expounded on the base of plenty of experiment data.