沥青高温流变评价指标对比

为了有效评价沥青混合料的高温抗变形性能,应用旋转粘度试验、动态剪切流变试验与重复蠕变试验,测试了粘度、车辙因子与蠕变模型参数,利用伯格斯模型对高温蠕变试验数据进行了拟合,结合沥青混合料高温车辙试验结果,分析了3种高温流变指标与沥青混合料高温性能的相关性。分析结果表明:车辙因子在评价改性沥青混合料高温性能时并不适用,模型参数与沥青混合料动稳定度的相关性最大,达到0.9887,说明蠕变参数可以准确地反映各种沥青混合料的高温抗变形性能。

Comparison of high-temperature rheologicai evaluation indices for bitumen

In order to effectively evaluate the high-temperature performance of asphalt mixture, rotary viscosity test, dynamic shear rheometer test and repeated creep test were conducted, viscosity, rut factor and creep model index were tested, the data of high-temperature creep test were fitted by using Burgers model, and the relativities between three rheological indices and the high-temperature performance were analyzed. Analysis result shows that rut factor doesn't fit to evaluate the high-temperature performance of modified asphalt mixture, the relative degree between creep model index and the dynamic stability degree of asphalt mixture is maximum, gets to 0.988 7, so creep model index can reflect the high-temperature performance of all kinds of asphalt mixtures accurately. 5 tabs, 5 figs, 10 refs.