Abstract In this study, the effect of coarse aggregate shape characteristics on the compactability and microstructural properties of asphalt mixtures was virtually investigated using a discreet element method (DEM). Results reveal there is a statistically significant correlation between coarse aggregate flatness, elongation, roundness, and sphericity as shape descriptors and initial asphalt mixture density, as a compaction parameter. Analyses indicate that among all particle shape descriptors, only roundness and regularity had a statistically significant relation with compaction slope, and as the amount of roundness and regularity increase, the compaction slope decreases. Additionally, flatness and elongation values >0.75 result in lower average coordination number values compared to those values

中文翻译：

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粗集料形状参数对沥青混合料压实特性的影响

摘要 在这项研究中，粗集料形状特征对沥青混合料的压实性和微观结构特性的影响使用离散元方法（DEM）进行了虚拟研究。结果表明，粗骨料平整度、伸长率、圆度和球形度作为形状描述符与初始沥青混合料密度作为压实参数之间存在统计学上显着的相关性。分析表明，在所有颗粒形状描述符中，只有圆度和规则性与压实斜率有统计上的显着关系，并且随着圆度和规则性量的增加，压实斜率减小。此外，与这些值相比，平整度和伸长率值 >0.75 会导致较低的平均配位数值