Study On High Temperature Performance Of PR PLAST S High Modulus Asphalt Mixture

As rutting is one of the main damage forms of asphalt pavement,in order to improve the high-temperature Performance of asphalt mixture,PR PLAST S(Performance Requirement PLAST Super high-performance plastic)was added into the asphalt mixture by admixture method.The high temperature stability of asphalt mixture was studied through rutting test and dynamic modulus test of uniaxial compression on the basis of mix proportion design of six kinds of high modulus asphalt mixture with different content PR PLAST S.The results show that PR PLAST S can mprove the high temperature performance of asphalt mixture.Six kinds of asphalt with PR PLAST S content were measured by dynamic shear rheological test,and it was found that PR PLAST S had certain modification effect on the high-temperature performance of matrix asphalt.The main conclusions are as follows:(1)considering asphalt stability at high temperature,anti-rut and anti-fatigue performance comprehensively,the optimal content of PR PLAST S is 7‰.(2)with the increase of PR PLAST S content,the dynamic modulus of asphalt mixture decreases continuously when the temperature is lower than 20 C.When the temperature is higher than 20 0C,the dynamic modulus of asphalt mixture increases first and then decreases.(3)when PR PLAST S content is 3‰,the maximum dynamic modulus of asphalt mixture increases by about 15%compared with that of asphalt mixture with 1‰content.Based on the high temperature stability of asphalt mixture,it is suggested that the content of PR PLAST S should be 3‰ of the total mass of asphalt mixture.This study provides a reference for the selection of asphalt mixture PR PLAST S content,which has certain research and application value.