大粒径透水性沥青混合料动态模量预估模型研究

Study on Dynamic Modulus Prediction Model of Large Stone Porous Asphalt Mixture

将不同级配类型沥青混合料动态模量实测结果与Witczak预测模型进行了比较,指出了Witczak预估模型并不适合预测开级配、大空隙率沥青混合料的动态模量。基于这个观点,开展多因素、多水平的沥青混合料动态模量试验,考察沥青混合料动态模量影响显著的因素,通过对动态模量试验结果进行回归分析,建立了大粒径透水性沥青混合料动态模量多元线性预估模型,同时对模型进行验证和修正,并对预估模型的适用性进行了初步探讨。

The measured results of dynamic moduli of asphalt mixture with different gradations were compared with those from Witczak model, which indicates that Witczak model is not suitable for prediction of dynamic modulus of open-graded asphalt mixture and asphalt with high porosity. Based on this view, a muhifactor and multilevel dynamic modulus test of LSPM was performed to find out the factors that have significant effect on the dynamic modulus of asphalt mixture. By regression analysis of the test result, the corresponding linearity prediction models of LSPM were set up, which was validated and modified by statistic means. Finally, the applicability of the prediction models was also mentioned.