Microstructural simulation of asphalt materials: Modeling and experimental studies
Microstructural simulation of asphalt materials: Modeling and experimental studies
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DOI：
10.1061/(asce)0899-1561(2004)16:2(107
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发表时间：
2004-03-01
影响因子：
3.2
通讯作者：
Shukla, A
中科院分区：
文献类型：
--
作者：
Sadd, MH;Dai, QL;Shukla, A
沥青混凝土是一种由集料、粘结剂水泥和空隙组成的非均质材料，并且可以被描述为胶结颗粒系统。这种材料的承载性能与骨料颗粒之间的局部荷载传递密切相关，这被视为微观结构响应。这种材料的行为的模拟是使用有限元技术，它被构造成模拟骨料/粘结剂系统的微观力学响应完成的。该模型结合了一个特殊的框架元素与刚度矩阵的网络开发，以预测胶结颗粒之间的载荷传递。刚度矩阵由颗粒间胶结层中应力场和位移场的近似弹性解建立。损伤力学的方法，然后与此解决方案相结合，这导致建设的软化模型能够预测沥青材料中发现的典型的全球非弹性行为。然后在ABAQUS有限元分析代码中实施该理论，以进行特定实验室样本的模拟。弹性响应的实验验证包括对专门制备的水泥颗粒系统的测试，该系统允许使用视频成像和计算机分析详细测量骨料位移和旋转。模型模拟与这些实验结果相比，有利的。已经进行了额外的模拟，包括实验室间接拉伸试验的非弹性行为，虽然这些结果在性质上是初步的，但也与实验数据进行了比较。
Asphalt concrete is a heterogeneous material composed of aggregates, binder cement, and air voids, and may be described as a cemented particulate system. The load carrying behavior of such a material is strongly related to the local load transfer between aggregate particles, and this is taken as the microstructural response. Simulation of this material behavior was accomplished using a finite element technique, which was constructed to simulate the micromechanical response of the aggregate/binder system. The model incorporated a network of special frame elements with a stiffness matrix developed to predict the load transfer between cemented particles. The stiffness matrix was created from an approximate elasticity solution of the stress and displacement field in a cementation layer between particle pairs. A damage mechanics approach was then incorporated with this solution, and this lead to the construction of a softening model capable of predicting typical global inelastic behaviors found in asphalt materials. This theory was then implemented within the ABAQUS finite element analysis code to conduct simulations of particular laboratory specimens. Experimental verification of the elastic response has included tests on specially prepared cemented particulate systems, which allowed detailed measurement of aggregate displacements and rotations using video imaging and computer analysis. Model simulations compared favorably with these experimental results. Additional simulations including inelastic behavior of laboratory indirect tension tests have been conducted, and while preliminary in nature these results also compared well with experimental data.