沥青混合料高温稳定性参数研究

Research on Parameters Affecting High-temperature Stability of Asphalt Mixture

为了能更好地评价车辙随温度和应力的变化规律,对三种不同级配沥青混合料,在不同温度和荷载水平下进行单轴静态蠕变试验,提取多种反映沥青混合料高温变形性能的力学参数,并进一步分析了这些参数在不同温度和荷载水平下的变化规律。结果表明,残余应变比、劲度模量和第二阶段的斜率b在随温度和应力的变化具有一定的规律性,且温度在50℃、荷载为0.7MPa时具有较好的区分度。

In order to evaluate the varying rules of rutting following the changes of temperature and stress more accurately, asphalt mixtures with three types of gradations were prepared to carry out the uniaxial static creep test at different temperatures and under different loads. Numbers of parameters that could reflect the deformation of asphalt mixture at a high temperature were monitored, and the varying rules of them following the changes of temperature and load were studied. The results indicate that residual strain ratio, stiffness modulus and slope b in phase 2 show some rules, with a clear distinction at 50℃ under 0.7 MPa.