水-荷载耦合作用下沥青混合料性能变化分析

传统的水对沥青混合料性能影响的研究主要集中在水稳定性上,而对水作用下沥青材料的长期性能研究较少。为此,首先进行了水、温、荷载综合作用下的沥青混合料耐久性能的室内试验设计;而后采用该方法对设计的沥青混合料进行了性能评价。研究结果表明：相应的试验设计在一定程度上模拟了实际沥青路面的水、温、荷载作用状况;水、温的动态作用使得沥青材料的使用寿命发生明显衰减;重载条件下,水-荷载的耦合作用对沥青路面使用寿命的衰减作用更加明显。

Performance variation analysis of asphalt mixture under the coupling action of moisture and loading

Research on the adverse influence induced by water on asphalt mixture usually focused on water stability, while the long-term effect of water has not been paid more attention to. As a result, at first, a laboratory test was designed to simulate the coupling action effect by moisture, temperature and loading on the long-term performance of asphalt mixture. Then, the proposed method was used to evaluate a designed mixture as an example. The result indicates that the designed test can simulate the actual coupling action induced by moisture, temperature and loading at a certain extent. At the same time it also shows that the dynamic action of water and temperature reduces the fatigue life of asphalt mixture, and that the adverse influence by water is more obvious at the condition of over-loading.