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YAN C B,FENG R L,LI R,et al.Morphological characterization of recycled coarse aggregates and their effects on concrete properties[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(4):170-179.

再生粗骨料形态表征及其对混凝土性能的影响

闫长斌1, 冯仁龙1, 李锐1, 赵海雷2, 杨振兴2, 杜朋召3, 杜卫长3

1.郑州大学 土木工程学院，河南 郑州  450001;2.盾构及掘进技术国家重点实验室，河南 郑州 450001;3.黄河勘测规划设计研究院有限公司，河南 郑州  450003

摘要: 目的 针对再生粗骨料形态研究涉及粒径范围有限及其对混凝土性能影响研究不足的问题，开展再生粗骨料形态表征及其对混凝土性能影响研究。  方法 利用三维激光扫描和图像处理技术，对比分析［4.75，31.5］ mm再生粗骨料球度、凸度、粗糙度和三维分形维数的形态分布规律，研究其形态特征对混凝土工作性能和力学性能的影响。  结果 结果表明：（1）［4.75，9.5］ mm粒径再生粗骨料的球度和粗糙度异质性最大，（9.5，16］ mm粒径的凸度异质性最大，而［26.5，31.5］mm粒径的球度、凸度和粗糙度异质性最小；（2）随着粒径增大，再生粗骨料的平均球度基本保持不变，凸度先降低后增大，粗糙度先降低后增大再降低，三维分形维数逐渐降低；（3）不同粒径区间的再生粗骨料均具有较强的分形特征，［4.75，31.5］ mm粒径区间的三维分形维数为2.010；（4）粗骨料中类球体和不规则骨料比例降低会导致混凝土坍落度降低，而抗压强度和劈裂抗拉强度先增加后降低；（5）再生粗骨料形态参数中，三维分形维数和球度对混凝土的工作性能影响最大，三维分形维数对抗压强度影响最大，球度对劈裂抗拉强度影响最大。  结论 再生粗骨料的球度与粒径基本无关，而凸度、粗糙度和三维分形维数随粒径变化而变化，不同形态参数对混凝土的工作性能和力学性能影响程度不同。

关键词:再生粗骨料;三维激光扫描;混凝土;球度;凸度;粗糙度;分形维数

doi:10.16186/j.cnki.1673-9787.2025070019

基金项目:国家自然科学基金资助项目（41972270）；盾构及掘进技术国家重点实验室开放基金资助项目（SKLST-2019-K06）；水利部黄河流域水治理与水安全重点实验室开放基金资助项目（2022-SYSJJ-06）

收稿日期:2025/07/18

修回日期:2025/10/16

出版日期:2026/06/17

Morphological characterization of recycled coarse aggregates and their effects on concrete properties

Yan Changbin1, Feng Renlong1, Li Rui1, Zhao Hailei2, Yang Zhenxing2, Du Pengzhao3, Du Weichang3

1.School of  Civil Engineering， Zhengzhou University， Zhengzhou  450001， Henan， China;2.State Key Laboratory of Shield Machine and Boring Technology， Zhengzhou  450001， Henan， China;3.Yellow River Engineering Consulting Co.， Ltd.， Zhengzhou  450003， Henan， China

Abstract: Objectives To address the limited particle size range in studies on the morphology of recycled coarse aggregates and the insufficient research on their effects on concrete properties.  Methods 3D laser scanning and image processing techniques were used to analyze the morphology distribution patterns of sphericity， convexity， roughness， and 3D fractal dimension of recycled coarse aggregates in the 4.75-31.5 mm range， and to investigate their effects on the workability and mechanical properties of concrete.  Results The results show that： 1. The greatest heterogeneity in sphericity and roughness was observed in recycled coarse aggregates of 4.75~9.5 mm， whereas convexity heterogeneity peaked in the 9.5~16 mm range. Aggregates of 26.5~`31.5 mm exhibited the lowest heterogeneity in sphericity， convexity， and roughness. 2. With increasing particle size， the average sphericity remained largely unchanged； convexity first decreased and then increased； roughness first decreased， then increased， and finally decreased again； the 3D fractal dimension gradually decreased. 3. Recycled coarse aggregates in all particle size intervals showed strong fractal characteristics， with a 3D fractal dimension of 2.010 for the 4.75–31.5 mm interval. 4. A decrease in the proportion of spheroidal and irregular aggregates reduced concrete slump， while compressive and splitting tensile strengths initially increased and then decreased. 5.  Among the morphological parameters， 3D fractal dimension and sphericity had the greatest influence on workability； 3D fractal dimension most affected compressive strength， and sphericity most affected splitting tensile strength.  Conclusions Sphericity is largely independent of particle size， whereas convexity， roughness， and 3D fractal dimension vary with particle size. These morphological parameters have varying degrees of influence on the workability and mechanical properties of concrete.

Key words:recycled coarse aggregate;3D laser scanning;concrete;sphericity;convexity;roughness;fractal dimension