Temperature Sensitivity Analysis of High Viscosity–Modified Asphalt

Abstract

In order to evaluate the temperature sensitivity of high viscosity–modified asphalt and explore a more reasonable temperature sensitivity evaluation method for high viscosity–modified asphalt, the temperature sensitivity of self-made high viscosity–modified asphalt, domestic high viscosity–modified asphalt, and SBS–resin–modified asphalt are evaluated using the methods of penetration index (PI), penetration viscosity index (PVN), viscosity temperature index (VTS), complex modulus index (GTS), and complex index (CNI); and the applicability of the five evaluation methods to the temperature sensitivity of high viscosity–modified asphalt is compared. The test result shows that (1) the self-made high viscosity–modified asphalt has the least temperature sensitivity, and its temperature sensitivity is better than that of other domestic high viscosity–modified asphalts, while the SBS–resin–modified asphalt has the greatest sensitivity to temperature, and the stabilizer is helpful to improve the temperature sensing performance of modified asphalt; (2) among the five temperature sensitivity evaluation methods, the data points collected using the PVN method cannot meet the wide temperature range of high viscosity–modified asphalt, and the test accuracy is low, which is not suitable for evaluating the temperature sensitivity of high viscosity–modified asphalt; (3) the PI method, VTS method, GTS method, and CNI method can be used to evaluate the temperature sensitivity of high viscosity–modified asphalt, among them, the temperature range adopted using the PI method is narrow and has certain limitation; and (4) the temperature range involved in the VTS method, GTS method, and CNI method is consistent with the service temperature of high viscosity–modified asphalt in actual asphalt pavement, while CNI method better considers the viscoelastic characteristics of high viscosity–modified asphalt, so it is more accurate and reasonable to evaluate the temperature sensitivity of high viscosity–modified asphalt.