Predicting the low-temperature performance of asphalt binder based on rheological model

Abstract

At present, the test methods to evaluate the low-temperature performance of asphalt binder focus on bending beam rheometer (BBR), and dynamic shear rheometer (DSR) is mainly used for high-temperature and medium-temperature tests. The reason is that when the test is in the low-temperature range, the instrument compliance errors are an unavoidable problem in DSR test. To solve this, based on the frequency sweep test of DSR, the modified Havriliak-Negami (MHN) model was employed to deduce the temperature at which asphalt binder undergoing the glass transition, and the torsion cylinder (TC) test and differential scanning calorimeter (DSC) were conducted to verify its correctness. Furthermore, the relationship between this approach and the low-temperature performance of asphalt binder is established by nonlinear fitting and linear regression analysis. This study presented an approach to predict the low-temperature performance of asphalt binder based on rheological model, which provides a solution to the difficulty of evaluating the low-temperature performance of asphalt binder using DSR.