Durability Study of In-situ Thermal Recycled Asphalt Mixtures Based on Freeze-Thaw Cycle
To study the durability of the in-situ thermal recycled asphalt mixture under the effect of the freeze-thaw cycle,this paper conducted the dynamic creep test,semi-circular bending test,and splitting test under multiple freeze-thaw cycles to evaluate the long-term properties of high temperature,low temperature and water stability of the recycled mixture.The results showed that the freeze-thaw cycle had significant influences on the durability of the recycled asphalt mixture.After multiple freeze-thaw cycles,the change rates of creep rate,the rheological number,and the permanent strain of the recycled asphalt mixture were all higher than those of the new asphalt mixture.The high-temperature deformation resistance of the recycled asphalt mixture was better than that of the new asphalt mixture under short-term freeze-thaw cycles,but worse under long-term freeze-thaw cycles.As the times of the freeze-thaw cycle increased,the recycled asphalt mixture showed an accelerated reduction in fracture energy and tensile strength ratio(TSR),indicating that the low-temperature crack durability and water damage durability of the recycled asphalt mixture would face serious challenges and it should draw more attention to the monitoring and evaluation of the durability of the recycled asphalt mixture.
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