Experimental Research on Thermo-oxidative Aging for Simulation of Pavement Asphalt Aging

Resistance to aging performance of asphalt materials is a key factor influencing the durability of asphalt pavement.Laboratory aging simulation test is an important method of studying resistance to aging performance of asphalt.To compare aging effects of different tests,five kinds of asphalt were aged by rolling thin film oven test(RTFOT),pressure aging vessel(PAV) aging test and oven aging at 60℃.Data from three simulation aging methods are compared,and then result from simulation aging tests and the data of recovered aged asphalt from field pavement are analyzed.The results and analysis indicate that there are correspondence and equivalence among those aging simulation tests,which can all reflect long-term aging behavior of asphalt in field pavement.Though aging conditions such as temperature and oxygen concentration are different,their aging mechanisms are the same,ie.oxidation reaction.We believe that retardation time RTFOT is a good test of asphalt aging simulation for long-term performance.