An Investigation on Rheological Behavior and Microstructure of a-Olefin Copolymer Modified Bitumen

摘要

This work describes the modification of 60/70 penetration grade bitumen with various commercially available a-Olefin copolymers. Rheological behavior of polymer modified bitumen samples containing 4 wt.% a-Olefin copolymer were investigated over a wide range of temperature and frequency in the linear viscoelastic regime. Temperature sweep tests showed that a pronounced enhancement in elastic response, particularly at high-service temperatures leading to gaining up even 5 high temperature classes could be achieved. Furthermore, rheological measurements and morphological observations proved the existence of a three dimensional elastic network created by swollen polymeric phase for blends containing polymeric modifier compatibilized by maleic anhydride grafting.