基于广义西格摩德模型研究沥青混合料动态模量和相位角主曲线

Research on Dynamic Modulus Master Curve and Phase Angle Master Curve of Asphalt Mixture Based on Generalized Logistic Sigmoidal Model

针对目前国内评价沥青混合料粘弹性性质时关注动态模量而忽略相位角的性质这一问题,对动态模量主曲线绘制方法进行完善并补充相位角主曲线绘制方法.采用4种沥青混合料试件进行单轴压缩动态模量试验,确定基于广义西格摩德模型的动态模量主曲线和存储模量主曲线,最后根据2种模量主曲线拟合参数计算得到相位角主曲线模型方程.结果表明,在动态模量和存储模量主曲线确定前提下,相位角主曲线拟合情况良好,反映出该方法绘制相位角主曲线是可行的.

Targeting at the problem that the current viscoelastic properties evaluation methods in China pay only attention to the dynamic modulus but neglect the phase,the dynamic modulus master curve drawing method is improved to determine the phase angle master curve.Uniaxial dynamic modulus tests are performed for four types of asphalt mixtures,the results of which are used to determine the dynamic modulus and storage modulus master curve based on the generalized logistic sigmoidal model.Besides,the master curve fitting parameters are used to calculate the phase angle master curve model equations.The results indicate that the master curve fitted is in good condition in the premise of certain dynamic modulus and storage modulus master curve,which reflects that the method is feasible in drawing the phase angle master curve.