Abstract: In view of the difficult modification of Karamay asphalts and the poor stability of the product, the physical and chemical modification methods were used to study the elemental composition, infrared spectra, group composition and molecular weight of four kinds of asphalts before and after modification as well as the differences from the properties of SBS-modified asphalts. The results showed that, compared with the physical modification, the chemical modification not only significantly reduced the reaction temperature of SBS modified asphalt, but also improved the high temperature performance of SBS modified asphalt.

Key words: SBS, modified asphalt, physical modification, chemical modification