级配玄武岩纤维增强沥青混合料性能研究

To improve performance of asphalt mixture enhanced by basalt fiber, a new design method to asphalt mixture, based on different length fiber combination, namely graded basalt fiber, was put forward. With the corresponding fiber asphalt mixture specimen, some experiments, including high-temperature rutting tests, immersion Marshall tests and freeze-thaw splitting tests and low temperature splitting tests were carried out. According to the tests, the high and low temperature performance, and water stability, were respectively studied. On the basis of test Study on graded basalt fiber enhancing asphalt mixture performanceresults, series of bar charts were drawn and grey correlation matrixes were built. Then, the effects of basalt fiber length granular composition on the performance of asphalt mixture were analyzed. The results show that the basalt fiber content and its length combination ratio are the most important factors influencing the performances of asphalt mixture. The best fiber combination is 30% 6 mm + 40% 9 mm + 30% 12 mm. The best performance of asphalt mixture is made from the continuous basalt firber length gradation. Then, the better is from the discontinuous. And the worst is from no fiber.