Performance Decay Law of Hot Recycled Asphalt Mixture with Different RAP Content
The asphalt mixture was simulated aging for 0,4,8 and 12 months by a self-developed life analyzer.Freeze-thaw splitting test,dynamic creep test and semi-circular bending test were used to study the decay law of various properties of hot recycled asphalt mixture with different RAP content after long-term aging.The results show that after 12 months of simulated aging,the rheological times of asphalt mixture reach the maximum when the RAP content is 30％.With the increase of RAP con-tent,TSR attenuation amplitude increases and fracture energy decreases.With 50％RAP content,the TSR attenuation of recycled aggregate is 7.9％larger than that of new aggregate,and the rheological times and fracture energy are reduced by 38.6％and 61.7％respectively.Under long-term aging,the effect of RAP content on fatigue life attenuation of asphalt mixture is not obvious,but it will reduce its stress sensitivity.
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