Evaluation on the High Temperature Performance Indices of SBS Modified Asphalt

In order to evaluate the high temperature performance of SBS modified asphalt, the essential influential factors of high temperature performance were investigated. First, five representative SBS modified asphalts were prepared. Second, the high temperature properties of the five modified asphalts were evaluated by softening point, dynamic viscosity, and multiple stress repeated creep recovery test index. The findings showed that the influence of SBS modifier content is the most influential factor. The non-recoverable creep compliance is very sensitive and can effectively characterize the high temperature performance of modified asphalt. The dynamic viscosity at 60°C was sensitive to the change of SBS modifier content, but insensitive to the other two factors. The softening point has a good correlation with the non-recoverable creep compliance and the recoverable strain. The changing of softening point before and after short-term aging can effectively reflect the difference in high temperature performance of modified asphalts.