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动态模量是沥青路面性能评价过程中用来表征沥青混合料刚度的关键指标。用单轴压缩动态模量试验结果对不同体积特征沥青混合料动态模量的各种预测模型进行比较分析。结果表明:文中采用的所有预测模型与试验结果较为一致。Witczak′s方程模拟的动态模量比试验结果稍大,而改进的Hirsh模型一般低估了模量值。新Witczak′s方程在较低加载频率时呈现出相对较高的偏差,但是当加载频率较高时,它的预测结果较好。Hashin′s细观力学分析模型由于几何简化假设,其精确预测沥青混合料动态模量是有限的。
Dynamic modulus is a key index used to characterize the stiffness of asphalt mixture in the evaluation of asphalt pavement performance. The uniaxial compression dynamic modulus test results were used to compare and analyze various prediction models of dynamic modulus of different volume characteristics of asphalt mixture. The results show that all the prediction models used in this paper are in good agreement with the experimental results. The dynamic modulus of the Witczak’s equation simulation is slightly larger than the experimental results, whereas the modified Hirsh model generally underestimates the modulus value. The new Witczak’s equation shows relatively high deviations at lower loading frequencies, but its prediction is better when the loading frequency is higher. Hashin’s Meso-Mechanical Analysis Model Due to geometric simplification assumptions, its accurate prediction of dynamic modulus of asphalt mixture is limited.