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采用SPT沥青混合料简单性能试验仪进行了重复加载三轴永久变形试验,选取了4种级配的沥青混合料(两种用SGC设计,两种用马歇尔设计)室内成型试件,以及车辙部位和无车辙部位的路面芯样,并进行了动稳定度对比试验。得出如下结论:沥青混合料的三轴重复加载永久变形量受混合料的级配、油石比、粉胶比、空隙率等因素的综合作用影响,不能简单以级配的粗细或者混合料的设计方法去评价混合料的三轴重复加载永久变形量。现场芯样的三轴重复蠕变试验与现场的车辙情况完全吻合。建议采用εp@5000作为重复加载永久变形的一个评判指标。
Three-axis permanent deformation test with SPT asphalt mixture simple performance tester was carried out. Four kinds of graded asphalt mixture (two kinds of SGC design and two kinds of Marshall design) And no rutting parts of the pavement core samples, and the dynamic stability of the comparative test. Draw the following conclusions: Asphalt mixture three-axis repeated loading permanent deformation by the mixture gradation, the ratio of oil to stone, cement ratio, porosity and other factors combined, can not simply grading or grading Design method to evaluate the mixture of three-axis repeated loading permanent deformation. The three-axis repeated creep test of the field core sample exactly matches the field rutting situation. It is advisable to use εp @ 5000 as an evaluation criterion for repeated loading permanent deformation.