Low-temperature properties evaluation index of Rubber Asphalt

Because of no appropriate low-temperature evaluation index to characterize the Rubber Asphalt (RA), the study on the low-temperature properties evaluation index of RA which was produced in wet process was conducted. Five-degree ductility test, Dynamic Frequency Scanning test, Bending Beam Rheological test and Differential Scanning Calorimetry test on the pure asphalts and RA were conducted in this study. The applicability, sensibility, and accuracy of the low-temperature properties evaluation indexes of RA were analyzed and validated. The results showed that the low–temperature properties of asphalt were improved significantly with rubber powder introduced. It was also found that using five-degree ductility as a low-temperature evaluation index of RA still needed consideration and a further improvement. Finally, T g index (Glassy transition temperature) and S T index (Continuous Grade temperature) were recommended as low-temperature properties evaluation indexes of RA. The study would provide references for building perfect low-temperature properties evaluation index system of RAs.