沥青混合料黏弹性主曲线模拟及换算

基于时间-温度等效原理将不同温度下沥青混合料的储存模量和蠕变柔量进行平移形成主曲线，采用广义Maxwell和Kelvin模型分别模拟沥青混合料的松弛和蠕变特性，利用Prony级数表达式和Laplace变换实现黏弹性主曲线间的相互换算，并将换算结果与试验结果进行了比较。结果表明，广义Maxwell和Kelvin模型可以较好地模拟沥青混合料黏弹性主曲线，储存模量和蠕变柔量主曲线相互换算结果与试验结果规律基本一致，松弛模量实际结果应介于由储存模量和蠕变柔量换算的松弛模量主曲线之间，这可为沥青混合料黏弹性力学研究及黏弹性参数的获取提供有益参考。

VISCOELASTIC MASTER CURVE SIMULATION AND CONVERSION OF ASPHALT MIXTURES

Master curves of dynamic modulus and creep compliance of asphalt mixtures at different temperatures are developed on the basis of time-temperature superposition principle. Generalized Maxwell and Kelvin models are performed to simulate relaxation and creep behavior, respectively. The viscoelastic master curves are converted reciprocally by using Prony series and Laplace transformation principle, and the converted master curves are compared with test results. The results show that the generalized Maxwell and Kelvin models can be employed to simulate viscoelastic master curves of asphalt mixtures; the viscoelastic master curves for creep and relaxation can be converted reciprocally; the master curves of storage modulus and creep compliance obtained from conversion are consistent with the test results; the authentic master curves of relaxation modulus should be between the results converted from storage modulus and creep compliance. The results provide a useful reference for the study on the viscoelastic mechanics and viscoelastic parameters of asphalt mixtures.