间接拉伸试验评价沥青混合料高温性能的研究

Use of Indirect Tensile Strength for Evaluating the Rut Resistance of Asphalt Mixture

采用间接拉伸试验,对不同温度、不同加载速率、不同沥青含量及不同级配下的沥青混合料间接拉伸试验(IDT)强度进行了研究,结果显示:温度和加载速率是影响试验结果的两个重要条件.通过将间接拉伸试验结果与车辙试验结果进行对比分析后发现,当试验温度为40℃和加载速率为50 mm/min时,混合料的IDT强度与车辙结果之间的相关性最好,可以作为评价沥青混合料高温性能的力学指标,建议在沥青混合料设计过程中采用.

In this paper,IDT strength of hot-mix asphalt mixture is researched through indirect tensile test under different test conditions.The results show that temperature and loading rate are two important test conditions.Comparing the results of indirect tensile test and rutting test,we found that IDT strength has obvious correlativity with result of rutting test when the loaing rate is 50mm/min at 40 ℃,which could be a kind of mechanical index estimating high-temperature performance of asphalt mixture.It is sugg...