沥青混合料非线性粘弹性本构关系研究

为进一步研究沥青混合料非线性粘弹性关系,采用简单性能试验机(SPT)在不同温度(5、25、45℃)和荷载作用频率(0.5、1、5、10、25 Hz)下的测定沥青混合料动态模量和相位角。通过对比Burgers模型与建立的分数导数模型对试验结果的拟合,表明分数导数模型较以往的模型能够较好地拟合试验曲线,拟合参数具有实际物理意义,能够用于描述沥青混合料的动态粘弹性性能。

A study on nonlinear viscoelastic constitutive equation of asphalt mixture

For further study of the nonlinear viscoelastic relationship of asphalt mixture,a simple performance test machine(SPT) was used to obtain the dynamic modulus and phase angle under different temperatures(5,25,45 ℃) and loading frequencies(0.5,1,5,10,25 Hz).Comparing the fitting results of the proposed fractional derivative model with those given by the Burgers model,the proposed model is found to be better fitting the experimental curves than the previous models.And the fitting parameters have physical significance.The proposed fractional derivative model can be used to describe the asphalt mixture dynamic viscoelastic properties.