Study on the Properties of Fiber-Reinforced Asphalt Mastic Based on the Multi-Scale Method

This study aims to investigate the effect of fiber mixed into asphalt mastic on the high and low temperature properties in a microscopic scale. In order to get the performances of fiber asphalt mastic, a serial of loboratory tests were conducted including the repeated creep recovery test (RCRT), the multi-stress creep recovery test (MCRT), and the bending creep stiffness test (BCST), also, the influence factors such as fiber contents, temperature, stress level, and fiber types were evaluated, respectively. The results indicate that: (1) fiber can improve the properties of asphalt mastic at high and low temperature, and this reinforcement effect is increased with increasing of fiber contents in a certain range. Moreover, it is sensitive to temperature, i. e., the increase of temperature can make the accumulated strain and its rate of fiber asphalt mastic all increase; (2) the effect of the stress level on high temperature performence is significant, where the mastic recovery rate R is decreased and irreversible creep compliance Jnr is increased with increasing of the stress value; and (3) the influence of fiber types on R value enhancement and Jnr reduction for mastic is remarkable under the high stress level, and its result is ranked in a decreased order as follows: basalt fiber, polyester fiber, glass fiber, and pure asphalt mastic [ control].