Properties of Styrene-Isoprene-Styrene (SIS) Modified Asphalt Binder

Physical and rheological properties of asphalt binder modified with Styrene-Isoprene-Styrene (SIS) were investigated through the rotational viscometer (RV), the dynamic shear rheometer (DSR), and the bending beam rheometer (BBR). In order to have a depth understanding on the SIS binder at micro level, morphological observations were conducted using optical microscopy. The result of this study showed that (1) the addition of SIS modifiers increases the viscosity and has positive effect on rutting resistance of the binder; (2) the higher the SIS content, the better the cracking resistance of the binder.