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Integrating a mortar model into discrete element simulation for enhanced understanding of asphalt mixture cracking
Computer-Aided Civil and Infrastructure Engineering ( IF 8.5 ) Pub Date : 2025-01-18 , DOI: 10.1111/mice.13425
Gyalwang Dhundup, Jianing Zhou, Michael Bekoe, Lijun Sun, Sheng Mao, Yu Yan

Cracks impact the performance and durability of asphalt pavements, necessitating a comprehensive understanding of the mixture cracking behavior. While discrete element modeling has been implemented, many studies oversimplify the simulation of asphalt mortar, a critical component affecting mixture cracking resistance. This study proposes a mortar model that is applicable to both two‐dimensional (2D) and, to a preliminary extent, three‐dimensional (3D) simulations. The model incorporates a geometric representation of mortar distribution and a mechanical softening model to simulate damage accumulation and fracture. Laboratory and virtual Superpave indirect tensile tests were performed on asphalt mixtures with varying gradations at different aging levels. The virtual simulations successfully mirrored indoor test results in volumetric parameters, load–displacement behavior, and stress distribution. Minor differences in strength, strain, and fracture energy between virtual and indoor tests confirmed the accuracy of the mortar model. Notably, the 3D simulations provided a more accurate reconstruction of the cracking process, showing smaller discrepancies between virtual and indoor results, compared to the 2D simulations, with errors in stress, strain, and fracture energy of 5.6%, 5.7%, and 4.7%, respectively. Employing the mortar model in discrete element simulation revealed insights into fracture angle distribution and tendencies, enabling meticulous analysis of mixture damage characteristics and cracking behavior. This allows for the improved design of mixtures with excellent cracking performance and contributes to advancing computational methods that could complement laboratory testing.

中文翻译:


将砂浆模型集成到离散元仿真中,以增强对沥青混合料开裂的理解



裂缝会影响沥青路面的性能和耐久性,因此需要全面了解混合料开裂行为。虽然已经实施了离散元建模,但许多研究过度简化了沥青砂浆的仿真,沥青砂浆是影响混合料抗裂性的关键组成部分。本研究提出了一种适用于二维 (2D) 和初步程度的三维 (3D) 模拟的砂浆模型。该模型结合了砂浆分布的几何表示和机械软化模型,以模拟损伤累积和断裂。对不同老化程度下具有不同级配的沥青混合物进行了实验室和虚拟 Superpave 间接拉伸试验。虚拟仿真成功地反映了室内测试结果的体积参数、负载-位移行为和应力分布。虚拟测试和室内测试之间强度、应变和断裂能量的微小差异证实了砂浆模型的准确性。值得注意的是,与 2D 仿真相比,3D 仿真提供了更准确的开裂过程重建,显示虚拟和室内结果之间的差异更小,应力、应变和断裂能量的误差分别为 5.6%、5.7% 和 4.7%。在离散元仿真中使用砂浆模型揭示了对断裂角度分布和趋势的见解,从而能够对混合物损伤特性和开裂行为进行细致的分析。这允许改进具有出色开裂性能的混合物设计,并有助于改进可以补充实验室测试的计算方法。
更新日期:2025-01-18
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