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)

摘要： 陶瓷纤维作为一种新型阻热材料，有提升沥青混合料高温性能的潜力。通过车辙试验、浸水马歇尔试验、冻融劈裂试验和低温弯曲试验对陶瓷纤维改性沥青混合料的路用性能进行评估；利用SEM扫描电镜试验从微观角度分析了陶瓷纤维改性沥青混合料的作用机理。研究结果表明：加入陶瓷纤维后混合料的高温性能和物理力学性能明显提升，水稳定性和低温性能有小幅增强。进一步的微观分析表明：分布于沥青混合料中的陶瓷纤维可通过吸附作用使结构沥青含量增多、沥青黏性增强，从而与矿料之间的界面作用力提升；加之纤维在混合料中可形成三维分散网状体系并传递应力，进而起到加筋阻裂的作用，最终对改善沥青混合料的路用性能有重要作用。

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