稳定型橡胶改性沥青混合料动态模量预估

Dynamic Modulus Prediction of Stabilized Rubber Modified Asphalt Mixtures

测试了8种混合料类别、12种级配组成的稳定型橡胶改性沥青混合料的动态模量,分析了稳定型橡胶改性沥青混合料的动态力学性能特点.针对Witczak模型对稳定型橡胶改性沥青混合料动态模量预测效果不理想的问题,采用Levenberg-Marquardt非线性回归方法修正了Witczak模型.结果表明:稳定型橡胶改性沥青混合料具有良好的动态力学性能;修正后的Witczak模型可以较好地预测稳定型橡胶改性沥青混合料的动态模量.

Dynamic moduli of stabilized rubber modified asphalt（SRMA） mixtures with twelve kinds of gra- dation composition in eight mixture types were tested, and dynamic mechanical characteristics of SRMA mixtures were analyzed based on the test results. In order to improve the prediction accuracy of Witczak model on dynamic moduli of SRMA mixtures, Levenberg-Marquardt nonlinear regression method was used for the model revision. The results show that SRMA mixtures have good dynamic mechanical properties, and dynamic moduli of SRMA mixtures can be preferably predicted by the revised Witczak model.