关键词: 道路工程；道路材料；路用性能；陶瓷纤维；沥青混合料；SEM

Abstract: As a novel thermal resistance material, ceramic fiber has the potential to improve the high temperature performance of the asphalt mixture. Through rutting test, immersion Marshall test, freeze-thaw splitting test and low-temperature bending test, the pavement performance of ceramic fiber modified asphalt mixtures was evaluated. The action mechanism of ceramic fiber modified asphalt mixture was analyzed by scanning electron microscopy (SEM). The results show that after adding ceramic fiber, the high-temperature properties and physical and mechanical properties of the mixture are significantly improved, and the water stability and low-temperature properties are slightly enhanced. Further microscopic analysis shows that the ceramic fibers distributed in the asphalt mixture can increase the content of structural asphalt and enhance the viscosity of asphalt through adsorption, so as to improve the interfacial force between asphalt and mineral aggregate. Furthermore, fiber in the mixture can form a three-dimensional dispersed network system and transfer stress, and then play the role of reinforcement and crack resistance, which plays an important role in improving the road performance of asphalt mixture finally.

Key words: highway engineering; road materials; pavement performance; ceramic fiber; asphalt mixture; scanning electron microscope (SEM)