Temperature Susceptibility of Modified Asphalt Binders

Abstract

Abstract Temperature is considered here as an important measurement affecting the behaviour of asphalt cement. The relationships between temperature and viscosity for ten pure and modified asphalt cements were thus assessed using traditional methods (including penetration, and (R&B) softening point) and dynamic shear rheometer (DSR) and rotational viscometer (RV) tests. The temperature used for testing were (25˚C), (120 to 195 ˚C), and (4 to 70 ˚C) for traditional, RV, and DSR tests, respectively. The effects of test type, asphalt cement type, modifier type, and content, on temperature-susceptibility were investigated. The results showed that using activation energy (Ea ) for flow allowed discernment of asphalt cement’s susceptibility to temperature variation, and that the addition of modifiers (SBS, BR, and BG) to asphalt cement increased the Ea indices. Higher increment rates in Ea (23.57%) were caused by the addition of BR, while reduced VTS was seen with the addition 9% BR, and 5% and 7% SBS, with reduction rate of 44.138%, 15.994% and 15.241%, respectively, due to reductions in viscosity changes with variation in temperatures, while the addition of 0.075% BG Plus increased VTS by 2.496% compared with base asphalt binder.