A micromechanical based three-dimensional DEM approach to characterize the complex modulus of asphalt mixtures
A micromechanical based three-dimensional DEM approach to characterize the complex modulus of asphalt mixtures
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DOI：
10.1016/j.conbuildmat.2012.09.036
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发表时间：
2013
影响因子：
7.4
通讯作者：
Huanan Yu;Shihui Shen
中科院分区：
文献类型：
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作者：
Huanan Yu;Shihui Shen
沥青混合料是一种典型的颗粒系统，其机械性能可以根据微观尺度的颗粒相互作用（接触）进行建模。一旦进行了微观校准，该模型就可以用于基于相同的接触机制来预测宏观特性。单个组分对混合物性能的影响也可以通过校准的微机械模型来捕获。本文开发了一种三维 DEM 方法来模拟沥青混合料的复模量。复数模量是一个重要的粘弹性材料属性，它描述了沥青混合料的应力和应变响应，并已纳入 DARWin-ME 力学经验路面设计程序中以指导路面设计。研究发现该模型可以成功预测传统密级配沥青混合料在较宽温度和频率范围内的动态模量和相角。高温下相位角的非线性行为也被捕获。评估关键模型参数对动态模量和相角的影响，有助于对材料力学性能的基本理解，并为沥青混合料的设计和建模提供有意义的指导。
Asphalt mixture is a typical particulate system whose mechanical performance can be modeled based on the particle interactions (contacts) at microscale. Once calibrated microscopically, the model can be used to predict the macroscopic properties based on the same contact mechanisms. The effect of individual component on the performance of the mixture can also be captured by the calibrated micromechanical model. In this paper, a three-dimensional DEM approach is developed to model the complex modulus of asphalt mixtures. Complex modulus is a crucial viscoelastic material property which describes the stress and strain responses of asphalt mixtures and has been incorporated into the DARWin-ME mechanistic empirical pavement design program to guide pavement design. The model is found to be successful in predicting both the dynamic modulus and the phase angle of a conventional dense graded asphalt mixture over wide ranges of temperatures and frequencies. The nonlinear behavior of the phase angle at high temperature is also captured. The effect of the key model parameters on the dynamic modulus and the phase angle are evaluated which contributes to the fundamental understanding of the material mechanical properties and provides meaningful guidance for the design and modeling of asphalt mixtures.