关键词: 沥青混合料, 粘弹性, 广义Maxwell模型, 有限元分析, 重复荷载, 变形

Abstract:

Asphalt mixture is a typical viscoelastic material, whose deformation law can be well described using the generalized Maxwell viscoelastic model. In this paper, the Prony series coefficients of the generalized Maxwell model are obtained by fitting the results of static creep test of AC-13C unmodified and modified asphalt mixtures. Then, a half-sinusoids load with 0.1 s loading duration and 0. 9 s unloading duration is used to simulate the dynamic vehicle load on the pavement. Moreover, the asphalt mixtures under repeated loads are analyzed by means of the viscoelastic finite element method, and the corresponding deformation consisting of both elastic strain and creep strain are predicted, with the results according well with the measured ones. As the creep strain leads directly to permanent deformation of asphalt mixtures, it is feasible to determine the elastic resilience of asphalt mixtures according to the creep strain.

Key words: asphalt mixtures, viscoelasticity, generalized Maxwell model, finite element analysis, repeated load, deformation