Abstract This study presents a 2D random aggregate structure generation algorithm for asphalt concrete. It involves two steps: first, the “convex-concave surface method” is proposed to generate random aggregate particles; second, the “double background grid method” is developed to place the generated aggregates and form the asphalt concrete mesostructure. The convex-concave surface method can produce aggregate particles randomly with both irregular convex and concave surfaces, enabling the generated aggregates to look realistic. Very few parameters are required during the particle generation, significantly simplifying the operation of input parameters. The double background grid method employs two types of background grids: the coarse grids are used to determine the placing position of the particle, whereas the fine grids are used to inspect if the particle overlaps with the placed ones; in this way, it effectively improves the placing efficiency. Besides, it allows for a predefined minimum gap between the adjacent particles, successfully guaranteeing the quality of finite element meshing. Based on the developed 2D random aggregate structure of asphalt concrete, a unified computational methodology for determining the effective thermo-mechanical properties is presented. The effectiveness of these methods is demonstrated using experimental data and typical values reported in the literature.

中文翻译：

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一种二维随机骨料结构生成方法：确定沥青混凝土的有效热机械性能

摘要 本研究提出了一种用于沥青混凝土的二维随机骨料结构生成算法。它包括两个步骤：首先，提出“凸凹面法”生成随机聚集颗粒；其次，开发了“双背景网格法”，放置生成的骨料，形成沥青混凝土细观结构。凸凹面法可以随机产生具有不规则凸面和凹面的聚集体颗粒，使生成的聚集体看起来逼真。在粒子生成过程中只需要很少的参数，大大简化了输入参数的操作。双背景网格法采用两种背景网格：粗网格用于确定粒子的放置位置，而精细网格用于检查粒子是否与放置的粒子重叠；这样，有效地提高了贴装效率。此外，它允许相邻粒子之间有一个预定义的最小间隙，成功地保证了有限元网格划分的质量。基于已开发的沥青混凝土二维随机骨料结构，提出了一种用于确定有效热机械性能的统一计算方法。使用实验数据和文献中报道的典型值证明了这些方法的有效性。基于已开发的沥青混凝土二维随机骨料结构，提出了一种用于确定有效热机械性能的统一计算方法。使用实验数据和文献中报道的典型值证明了这些方法的有效性。基于已开发的沥青混凝土二维随机骨料结构，提出了一种用于确定有效热机械性能的统一计算方法。使用实验数据和文献中报道的典型值证明了这些方法的有效性。