Abstract: Because of the lack of existing studies of silane coupling agent modified basalt fiber reinforced asphalt mucilage, this study used silane coupling agent KH-550 to modify the surface of basalt fiber and then prepared fiber reinforced asphalt mucilage in different powder binder ratios and dosages of fiber. The performance of low temperature, middle temperature and high temperature of these specimens were studied by low temperature ductility test, elastic recovery test, cone penetration test and softening point test and then the enhancement mechanism of modified basalt fiber reinforced asphalt mucilage was analyzed. The results show that modified basalt fiber had good wettability with asphalt mucilage; the adhesion between fiber and asphalt mucilage was strong; fiber′s surface film thickness of asphalt mucilage was large and the mechanical properties of modified fiber was significantly developed. When the powder binder ratio is between 0.8~1.0 and the dosage of modified fiber is between 0.4%~0.6%, the tensile strength, anti-shearing strength, elastic recovery ratio and softening point of asphalt mucilage were significantly enhanced, which indicate the abilities of low temperature anti-cracking, high temperature anti-shearing, fatigue performance and self-healing were improved. This study provides popularization and application of mineral fiber composite in road engineering.

Key words: composite, silane coupling agent, basalt fiber, asphalt mucilage, performance, enhancement mechanism