Research on Fatigue–Healing Performance of Asphalt Mixture Based on the Semicircular Bending Test

In order to study the self-healing performance of macroscopic fractures asphalt mixtures, semicircular bending (SCB) tests were used test 90# base SBS (Styrene–Butadiene–Styrene) modified and + CR (Chloroprene Rubber) composite mixtures. The F-H-F (the mixture specimen was fatigued for a certain number times, then healed under conditions, until destroyed) carried out, fatigue life recovery rate before after healing defined as index (HI). gray correlation analysis method judge influence degree influencing factors on fatigue–healing according index. results show type has most significant ability mixture. case complete healing, best, followed by SBS-modified mixture, asphalt. When temperature is close softening point asphalt, better when low. time longer, better, there an optimal time. decreased with increase in damage. damage too large, will be difficult heal.