Abstract:This article introduces a repair material being characteristic of high-performance concrete doped with vapor grown carbon nano-fiber reinforcement (VGCF) and carbon nano-tubes (CNT) for runway. That material of adding nano-fibers to concrete can improve its mechanical properties and endurance is a well-known fact. However, the uneven distribution of nano-fibers in the cement matrix can lead to a decrease in performance. The article focuses on the adaptability of repair materials and cement-based pavement materials, and analyzes the influence of carbon nano-fiber materials on the micro mechanism of con crete reinforcement. Mix proportion tests are conducted by doping carbon nano-fibers with different mass fractions in concrete, and the compressive strength, bonding strength, mass loss rate under freeze-thaw cycles, and bonding strength loss rate are measured respectively. The research shows that when the CNT104 content is 0.1%, the compressive strength and bonding strength of concrete are 60.6 MPa and 11.3 MPa respectively, and the 150 freeze-thaw cycles being over, the mass loss is minimum. When the content of CNT107 is 0.15%, the compressive strength and bonding strength are fairly good, i.e. 59.1 MPa and 11.5 MPa respectively. When the content reaches 0.2%, the mass loss is minimal after 150 freeze-thaw cycles. When the VGCF content is 0.15%, the concrete reaches its maximum compressive strength and bonding strength, i.e. 68.0 MPa and 18.6 MPa respectively. At the same time, the concrete with different contents of VGCF shows better frost resistance. At a content of 0.15%, the quality loss rate of concrete after freeze-thaw cycles is the lowest. After 150 freeze-thaw cycles, the bond strength is measured again. By comparing before and after freeze-thaw, it is found that the decrease rate of bond strength with 0.15% VGCF added is 32.79%, which is the lowest among all groups. The results indicate that taking UHPC mixed with 0.15% VGCF as runway repair material, its fairly good adaptability to cement-based pavement materials is very protruding.