基于GTM试验的沥青混合料高温性能评价指标

摘要

A research on variable paramenters of GTM tests of different asphalt mixture is careied out. A corelafive analysis was made between those parameters and laboratory results of the corresponding triaxail repeated load creep tests. Parameter K1 of eompaciton curve which is obtained from GTM test ( K1 here refers to the average slope of compaciton curve from the start of compaciton to 97％ density) can better show the high temperature stability performance of asphalt mixture as parameter K1 has a good correlative relationship with creep stiffness modulus of triaxial repeated load creep test, and the linear correlation coefficient is above 0.90. Thus, K1 can be adopted as a simple and practical method to evaluate high temperature stability performance of asphlat mixture.%通过对不同沥青混合料GTM旋转压实试验各项参数的研究,并将其与相应的三轴重复荷载蠕变试验结果进行相关性分析,得出:利用GTM旋转压实试验得到的压实曲线参数K1(从开始压实至97%密实度间的压实曲线平均斜率)可以较好地表征沥青混合料的抗高温稳定性能,其与三轴重复荷载蠕变试验的蠕变劲度模量指标具有较高的相关性,线性相关系数在0.90以上,参数K1可以作为评价沥青混合料抗高温稳定性能的一种简易而实用方法.