二次老化对再生沥青混合料疲劳性能影响分析

针对再生沥青混合料在使用时存在的二次老化问题,对不同RAP掺配率下的沥青混合料进行试验室加速老化,并进行直接拉伸疲劳试验。结果表明,二次老化后沥青混合料的强度较老化前有所提高,疲劳寿命会有大幅度的降低,沥青混合料的疲劳寿命与应力比在双对数坐标中具有良好的线性关系。

Analysis of influence on Fatigue Characteristics After Second Aging Processes RAP Mixtures

For research the recycled asphalt mixture after second aging processes based on differ- ent RAP blending rate, the laboratory accelerated aging method was used and the direct tensile fatigue test was carried. The results show that, the second aging of asphalt mixture strength increased than that non aging, while fatigue life reduced. The fatigue life of asphalt mixture has good linear relationship with the stress ratio in double logarithmic coordinates.