河南理工大学学报（自然科学版）2026，Vol.45Issue(4)：170-179,10.DOI:10.16186/j.cnki.1673-9787.2025070019
再生粗骨料形态表征及其对混凝土性能的影响
Morphological characterization of recycled coarse aggregates and their effects on concrete properties
摘要
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 re-cycled 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 af-fected 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 me-chanical properties of concrete.关键词
再生粗骨料/三维激光扫描/混凝土/球度/凸度/粗糙度/三维分形维数Key words
recycled coarse aggregate/3D laser scanning/concrete/sphericity/convexity/roughness/3D fractal dimension分类
建筑与水利引用本文复制引用
闫长斌,李锐,冯仁龙,赵海雷,杨振兴,杜朋召,杜卫长..再生粗骨料形态表征及其对混凝土性能的影响[J].河南理工大学学报（自然科学版）,2026,45(4):170-179,10.基金项目
国家自然科学基金资助项目(41972270) （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) （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) （2022-SYSJJ-06）
