Thirteen hot asphalt mixtures were tested for fatigue in four-point beam configuration. Theresults were analysed using the MEPDG fatigue model and a modified version of it, which included binders’ thermal susceptibility as an additional forecasting variable. Seven mixtures were dense-graded, three were stone mastic asphalts and three were semi-open. Three mixtures used unmodified asphalt binders UB, while the rest had SBS polymer modified binders PMB. The fatigue lives of PMB mixtures were one order of magnitude higher than UB ones. The results indicated that the higher the degree of modification in the binder, the higher the fatigue life. No significant differences in fatigue life were observed between the three aggregate gradations. The MEPDG fatigue model parameters were calibrated using the test results. The predictions showed very low accuracy. When including the binders’ thermal susceptibility as an additional forecasting variable, significant improvements were achieved in the accuracy of the predictions.

在四点梁配置中测试了 13 种热沥青混合料的疲劳。使用 MEPDG 疲劳模型及其修改版本对结果进行了分析，其中将粘合剂的热敏感性作为额外的预测变量。七种混合物是密级配的，三种是石胶沥青，三种是半开放的。三种混合物使用未改性的沥青粘合剂 UB，而其余的使用 SBS 聚合物改性的粘合剂 PMB。PMB 混合物的疲劳寿命比 UB 高一个数量级。结果表明，结合剂的改性程度越高，疲劳寿命越高。在三个骨料等级之间没有观察到疲劳寿命的显着差异。使用测试结果校准 MEPDG 疲劳模型参数。预测的准确性非常低。当将粘合剂的热敏感性作为额外的预测变量时，预测的准确性得到了显着提高。