- 期刊
Fatigue Performance Of High-Modulus Basalt Fiber-Reinforced Asphalt Mixture
摘要
An effective way to improve the rutting resistance of asphalt pavement is to increase the modulus of the middle surface layer of the asphalt mixture. However, the fatigue performance of high-modulus asphalt mixtures hinders this development. In this study, we enhanced the fatigue property of high-modulus asphalt mixtures by adding basalt fiber. Marshall tests were performed to evaluate the effect of the basalt fiber and a high-modulus modifier on various Marshall test results. The results were analyzed and compared with the performance of SBS-modified (Styrene-Butylene-Styrene) asphalt mixes. Adding basalt fiber increased the asphalt-aggregate ratio, decreased the density, and reduced air voids in the mixture. The stability also slightly increased, and the flow slightly decreased. Moreover, 0.2% basalt fiber increased the fatigue resistance of high-modulus asphalt mixture 1.9 times, and this improvement increases with the increasing basalt content. The elastic modulus of basalt fiber is considerably higher than that of asphalt; therefore, the proportion of stiffer components in the asphalt mastic was higher after mixing. Furthermore, basalt fiber absorbs oil (asphalt); accordingly, the increased asphalt content slightly enhanced the fatigue resistance of the mixture.