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沥青混合料的动态模量是沥青路面设计的重要参数,间接拉伸试验的优势决定了在该试验模式下测定沥青混合料动态模量的重要意义。采用我国3种典型的沥青混合料,在间接拉伸试验模式下,基于GPM测试模式,通过修正的二轴方向的应力和应变决定沥青混合料的动态模量。根据时间-温度转换原则,通过Hirsch模型估算混合料模量极大值,分别采用Global Aging模型和Arrhenius模型获得移位因子,通过数值优化发展了参考温度为20℃的3种典型沥青混合料动态模量及相位角主曲线,得出了主曲线的Sigmoidal数学模型,拟合的相关系数R2均在0.99以上,表明模型拟合效果非常好。
The dynamic modulus of asphalt mixture is an important parameter of asphalt pavement design. The advantage of indirect tensile test determines the significance of determining the dynamic modulus of asphalt mixture in this test mode. Based on the GPM test mode, the dynamic moduli of asphalt mixture are determined by the stress and strain in the biaxial direction under the indirect tensile test mode using three kinds of typical asphalt mixtures in China. According to the principle of time-temperature conversion, the maximum modulus of mixture was estimated by Hirsch’s model. The displacement factors were obtained by using Global Aging model and Arrhenius model respectively. Three kinds of typical asphalt mixtures with reference temperature of 20 ℃ were developed by numerical optimization Modulus and phase angle of the main curve, the Sigmoidal mathematical model of the main curve was obtained, the fitting coefficient of correlation R2 were above 0.99, indicating that the model fitting effect is very good.