Abstract: In order to study the prediction model of fracture-healing property of asphalt mixture, in this paper, 70# matrix asphalt and SBS modified asphalt were used to make AC-13 mixture semi-circular specimen. The load-displacement curves were obtained through the semi-circular bending test (SCB), and the cracked semi-circular specimen was spliced and placed in an oven for healing. The secondary loading was applied to the healed specimen. The peak load ratio after and before healing was used as the healing index (HI) to evaluate the fracture-healing property of the mixture. According to the capillary flow principle, the prediction model of asphalt mixture healing was established, and it was used to fit the test results. The conversion equation between healing time and temperature during HI fixation was established by fitting equation. The results show that the fractured asphalt mixture has the secondary bearing capacity after healing in a specific environment. Although the HI value is less than 1.0, it can reach 0.7 in the healing condition of 100 ℃ &12 h, That is, the tensile strength recovers by 70% after healing; When the healing time is from 4 h to 8 h and 8 h to 12 h, the HI growth rate of 70# AC-13 asphalt mixture in 100 ℃ are 0.096/h and 0.023/h, respectively. The HI growth rate of SBS AC-13 asphalt mixture are 0.096/h and 0.009/h, respectively, it shows that HI increases with the increase of healing time, but the growth rate increases first and then decreases. A function HI(t)=(-1+e-Ct)2(C>0)can be used to fit the change of healing index with healing time at different healing temperatures, and the fitting coefficient is R2>0.90. Based on the principle of time-temperature equivalence, a transition model t(T)=C3·eC4/T(0<C3<1,0<C4, R2>0.95) between healing temperature and healing time is established.
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