Rheological characterization of stryene-buta- diene-styrene copolymer modified bitumens

摘要

The rheological properties of styrene-butadiene-styrene copolymer (SBS) modified bitumens were studied. The modified binders were prepared using a laboratory mixer. Five types of bitumen from four sources were mixed with two SBS polymers at different polymer content levels. The rheological properties of the modified binder were characterized using dynamic mechanical analysis over wide ranges of temperatures and frequencies. It was found that the addition of the SBS polymers in creased the binder elasticity at high temperatures and improved the binder flexibility at low temperatures.