Abstract: SBS modified asphalts were prepared by using four kinds of matrix asphalts with different components, and the viscoelastic properties of the modified asphalts were analyzed by dynamic mechanical analysis (DMA). The results showed that the high temperature properties of modified asphalts obtained by temperature scanning, frequency scanning and steady flow test are consistent. The aromatic content of matrix asphalts is the main factor influencing the viscoelastic properties of modified asphalts. The viscoelastic performance of modified asphalts gets better with the rise of aromatic content, while the content of high saturated component would weaken the cohesion of modified asphalts, reducing the high-temperature viscosity. The bending beam rheometer tests showed that the resin and asphaltene mainly affect the low-temperature performance of the modified asphalts. The low-temperature extensibility of modified asphalts becomes poor when asphaltene content is too high.

Key words: DMA, SARA components, SBS modified asphalt, viscoelastic property