基于路用性能的沥青混合料的最佳沥青用量

Optimum asphalt mixture content based on pavement performance

为了研究按路用性能确定沥青混合料的最佳沥青用量,采用旋转压实仪(GTM)模拟施工工况,分别对Sup-13、Sup-16两种级配进行了GTM成型试验,通过拟合测定的旋转稳定系数(GSI)随油石比变化曲线的曲率半径突变点,确定了Sup-13的最佳油石比为4.8%,Sup-16的最佳油石比为4.9%。室内模型足尺加速加载试验和试验路用性能长期观测表明:GTM法确定最佳沥青用量的沥青混合料路用性能优于马歇尔法;旋转稳定系数突变点确定的最佳沥青用量是合理的;突变点处的油石比与路用性能具有很好的相关性。

In order to ascertain optimum asphalt mixture content according to pavement performance, this paper established a gyrators-test-model（GTM） to simulate construction condition and respectively conducted GTM forming experiment of the two kinds gradation of Sup-13, Sup-16. The optimum asphalt mixture content could be confirmed through fitting curvature radius catastrophe point of the gyrators-stability-index changing tendency followed the asphalt content variation curves. The optimal asphalt content of Sup-13 is 4.8%, and the one of Sup-16 is 4.9%. Acceleratedqoading-facility laboratory test and long-term-pavement-performance observation prove that the pavement performance through GTM method to ascertain optimum asphalt binder content is superior to Marshall method. It is reasonable to ascertain optimum asphalt mixture content based on catastrophe point. There is a good correlation between the asphalt mixture content in catastrophe point and pavement performance. 7 tabs, 6 figs, 10 refs.