粗集料轮廓对沥青混合料细观力学的影响机制

贺军; 虞将苗; 李伟雄; 陈搏; 石立万; 张肖宁

doi:10.12141/j.issn.1000-565X.250121

华南理工大学学报(自然科学版) >

2025 , Vol. 53 >Issue 12: 140 - 152

DOI: https://doi.org/10.12141/j.issn.1000-565X.250121

材料科学与技术

粗集料轮廓对沥青混合料细观力学的影响机制

贺军 ,
虞将苗 ,
李伟雄 ,
陈搏 ,
石立万 ,
张肖宁

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^1.华南理工大学土木与交通学院，广东广州 510640
^2.广州肖宁道路工程技术研究事务所有限公司，广东广州 510640
^3.佛山大学土木与交通学院，广东佛山 528000

贺军（1984—），男，博士生，主要从事道路工程结构与材料研究。E-mail： cthejuntyr@mail.scut.edu.cn

虞将苗（1979—），男，博士，教授，主要从事道路工程结构与材料研究。E-mail： yujm@scut.edu.cn

收稿日期: 2025-04-23

网络出版日期: 2025-06-06

基金资助

国家自然科学基金项目(52178426)

收起

Influence Mechanism of Coarse Aggregate Morphology on Meso-Mechanical Behavior of Asphalt Mixtures

HE Jun ,
YU Jiangmiao ,
LI Weixiong ,
CHEN Bo ,
SHI Liwan ,
ZHANG Xiaoning

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^1.School of Civil Engineering and Transportation，South China University of Technology，Guangzhou 510640，Guangdong，China
^2.Guangzhou Xiaoning Road Engineering Technology Research Institute Co. ，Ltd. ，Guangzhou 510640，Guangdong，China
^3.School of Civil Engineering and Transportation，Foshan University，Foshan 528000，Guangdong，China

贺军（1984—），男，博士生，主要从事道路工程结构与材料研究。E-mail： cthejuntyr@mail.scut.edu.cn

Received date: 2025-04-23

Online published: 2025-06-06

Supported by

the National Natural Science Foundation of China(52178426)

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摘要

为了揭示粗集料轮廓形态特征对沥青混合料细观力学的影响机制，该文采用数字图像处理技术获取粗集料轮廓特征，构建多形态特征粗集料离散元模型，结合单轴贯入虚拟试验系统研究了集料几何形态对沥青混合料细观力学响应的影响。研究结果表明：集料颗粒间接触点处存在拉/压混合应力模式，接触点处压应力比例为40%~50%，拉应力比例为10%~20%，拉压混合应力比例为30%~40%；单轴贯入荷载的作用导致微裂缝数量快速增长，针片状集料含量较高的混合料的粗集料模型中，集料-沥青界面的微裂缝较快连接形成贯穿裂缝，而对于立方体粗集料含量较高的混合料，界面微裂缝分布面积较小且应力水平较低；微裂缝主要由剪应力引发，其数量约占微裂缝总数的90%，由拉应力作用的微裂缝数量较少，约占微裂缝总数的10%；微裂缝最长达到10 mm，最短长度为0.2 mm左右；对于立方体粗集料较多的混合料，骨架嵌挤作用可以有效抵抗荷载作用。研究成果为沥青路面施工过程中的粗集料筛选，以及提升粗集料加工质量提供了理论依据。

关键词： 沥青混合料; 粗集料轮廓; 离散元; 密实状态; 细观力学

本文引用格式

贺军 , 虞将苗 , 李伟雄 , 陈搏 , 石立万 , 张肖宁 . 粗集料轮廓对沥青混合料细观力学的影响机制[J]. 华南理工大学学报(自然科学版), 2025 , 53(12) : 140 -152 . DOI: 10.12141/j.issn.1000-565X.250121

Abstract

To reveal the influence mechanism of coarse aggregate profile characteristics on the meso-mechanical properties of asphalt mixtures, this study employed digital image processing technology to obtain the profile characteristics of coarse aggregates and constructed discrete element models of coarse aggregates with multiple morphological features. Combined with a virtual uniaxial penetration test system, the impact of aggregate geometry on the meso-mechanical response of asphalt mixtures was investigated. The results indicate that a mixed tensile-compressive stress mode exists at aggregate contact points, with compressive stress accounting for 40%~50%, tensile stress for 10%~20%, and mixed stresses for 30%~40% of the total. The application of uniaxial penetration load leads to rapid growth in microcrack numbers. In mixtures with higher elongated and flat aggregate content, microcracks at the aggregate-asphalt interface connect more readily to form through cracks, whereas mixtures with higher cubical aggregate content exhibit smaller microcrack distribution areas and lower stress levels. Microcracks are mainly induced by shear stress, accounting for about 90% of total microcracks; the number of microcracks caused by tensile stress is relatively small, accounting for about 10%. The maximum microcrack length reaches 10 mm, while the minimum is approximately 0.2 mm. For mixtures rich in cubical coarse aggregates, skeleton interlocking effectively resists loading. These findings provide theoretical support for coarse aggregate selection in asphalt pavement construction and quality improvement in aggregate processing.

Key words： asphalt mixture; coarse aggregate morphology; Discrete Element Method（DEM）; compaction state; meso-mechanical performance

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