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为把握沥青混合料抗车辙性能实质,优化设计效果,利用汉堡车辙仪测试了不同混合料的高温稳定性,对其进行了旋转压实和间接拉伸试验,并对试验结果进行了回归分析。试验结果显示级配对混合料高温性能有重要影响,且根据走向确定矿料级配具有较强的局限性;通过改变油石比、测试温度和加载速率等,建议间接拉伸试验的测试条件为温度40℃,加载速率50 mm/min;在分析混合料车辙深度影响因素基础上,利用破坏荷载、CEI和VMA建立了三元一次的沥青混合料车辙简化预估模型,线性回归相关系数达到0.97;汇总提出了基于SGC和IDT的沥青混合料设计方法设想,即利用SGC成型混合料,使用马歇尔稳定度仪测试破坏强度从而确定最佳油量,进而根据SGC和IDT信息预测混合料高温稳定性。
In order to grasp the essence of rutting resistance of asphalt mixture and optimize the design results, the high temperature stability of different mixtures was tested by the Hamburg rut tester. The rotary compaction and indirect tensile tests were carried out. The regression analysis of the test results was carried out. The test results show that gradation has an important influence on the high temperature performance of the mixture, and there is a strong limitation in determining the gradation of the ore material according to the trend. By changing the ratio of oil to rock, the test temperature and the loading rate, it is suggested that the test conditions of the indirect tensile test are temperature 40 ℃ and the loading rate of 50 mm / min. On the basis of analyzing the influencing factors of the rutting depth of the mixture, the simplified prediction model of rutting of asphalt mixture with ternary once was established by using the destructive load, CEI and VMA. The linear regression correlation coefficient reached 0.97. Summarizes the design idea of asphalt mixture based on SGC and IDT, that is, using SGC forming mixture, using Marshall stability tester to test the breaking strength to determine the best oil content, and then using SGC and IDT information to predict the high temperature stability of the mixture.