磨耗对再生混凝土骨料物理性能及表观形态的影响

doi:10.16552/j.cnki.issn1001-1625.2025.0222

摘要/Abstract

摘要： 为探究物理磨耗对不同强度母体混凝土再生骨料物理性能及形态特征的影响,采用洛杉矶磨耗仪对C35、C40、C50等级混凝土破碎制备的再生骨料进行了物理强化,探究了钢球数量、转动圈数对不同强度母体混凝土再生骨料表观密度、吸水率和压碎值的影响;通过集料图像采集系统(AIMS)采集强化前后骨料表观形态特征,分析了物理磨耗对粗骨料棱角度、纹理及球度等形态特征的影响。结果表明,再生骨料的物理性能及形态特征受钢球数量、转动圈数与母体混凝土强度的显著调控。采用8个钢球400转磨耗时,C35再生骨料表观密度较原始破碎时提高了1.52%,吸水率下降了36.05%,压碎值降低了27.41%,棱角性系数下降了34.28%,球度提升了19.61%,纹理指数增加了9.30%。进一步增加钢球数量或转动圈数会导致骨料二次破碎,性能提升幅度降低,再生骨料表观密度与母体混凝土强度呈负相关,压碎值与强度呈正相关。吸水率与强度之间未表现出明显的相关性,整体呈波动变化趋势。棱角性系数与球度随强度提高呈先下降后上升的趋势,纹理指数则表现为先上升后下降。8个钢球400转的磨耗参数可在提升再生骨料物理性能的同时优化其形貌特征,为再生骨料的精细化处理提供理论依据。

关键词: 再生骨料, 物理磨耗, 母体混凝土强度, 物理性能, 形态特征

Abstract: To investigate the effects of physical abrasion on the physical properties and morphological characteristics of recycled aggregates derived from parent concrete of varying strengths, recycled coarse aggregates were produced from C35, C40, and C50 grade concretes and subjected to physical enhancement using a Los Angeles abrasion machine. The influences of steel ball quantity and number of revolutions on the apparent density, water absorption, and crushing value of recycled aggregates from different parent concrete strengths were examined. The aggregate image measurement system (AIMS) was employed to collect morphological characteristics of the aggregates before and after abrasion treatment, focusing on angularity, texture, and sphericity. The results show that the physical properties and morphological characteristics of recycled aggregates are significantly influenced by the number of steel balls, rotation counts, and parent concrete strength. Under the condition of 8 steel balls and 400 revolutions, the apparent density of C35 recycled aggregates increases by 1.52%, the water absorption decreases by 36.05%, and the crushing value reduces by 27.41%. Additionally, the angularity index decreases by 34.28%, the sphericity increases by 19.61%, and the texture index increases by 9.30%. Further increasing the number of steel balls or revolutions leads to secondary crushing of the aggregates, resulting in diminished performance improvement. Apparent density is negatively correlated with parent concrete strength, while the crushing value shows a positive correlation. Water absorption does not exhibit a clear correlation, showing a fluctuating trend. Angularity index and sphericity show a decreasing-then-increasing trend with increasing strength, whereas texture index displays an opposite trend. The abrasion condition of 8 steel balls and 400 revolutions can simultaneously improve the physical properties and optimize the morphological characteristics of recycled aggregates, providing a theoretical basis for their refined processing.

Key words: recycled aggregate, physical abrasion, parent concrete strength, physical property, morphological characteristic

中图分类号:

TU528

吕洁琴, 袁豪, 高玲, 王岩, 顾杨, 孙仁娟. 磨耗对再生混凝土骨料物理性能及表观形态的影响[J]. 硅酸盐通报, 2025, 44(9): 3218-3226.

LYU Jieqin, YUAN Hao, GAO Ling, WANG Yan, GU Yang, SUN Renjuan. Effect of Abrasion on Physical Properties and Apparent Morphology of Recycled Concrete Aggregates[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(9): 3218-3226.

参考文献

[1] 程欢, 黄法礼, 李化建, 等. 铁路工程废弃混凝土资源化再利用现状[J]. 铁道建筑, 2021, 61(11): 1-5.
CHENG H, HUANG F L, LI H J, et al. Current situation of resource reuse of waste concrete in railway engineering[J]. Railway Engineering, 2021, 61(11): 1-5 (in Chinese).
[2] AGARWAL A, BHUSNUR S, SHANMUGA PRIYA T. Experimental investigation on recycled aggregate with laboratory concrete waste and nano-silica[J]. Materials Today: Proceedings, 2020, 22: 1433-1442.
[3] KIM J. Influence of quality of recycled aggregates on the mechanical properties of recycled aggregate concretes: an overview[J]. Construction and Building Materials, 2022, 328: 127071.
[4] 陈春红, 陈云春, 王磊, 等. 母体混凝土强度对再生骨料及再生骨料混凝土性能影响研究进展[J]. 硅酸盐通报, 2023, 42(12): 4183-4196.
CHEN C H, CHEN Y C, WANG L, et al. Research progress on influence of parent concrete strength on properties of recycled aggregate and recycled aggregate concrete[J]. Bulletin of the Chinese Ceramic Society, 2023, 42(12): 4183-4196 (in Chinese).
[5] 冯春花, 黄益宏, 崔卜文, 等. 建筑再生骨料强化方法研究进展[J]. 材料导报, 2022, 36(21): 88-95.
FENG C H, HUANG Y H, CUI B W, et al. Research progress on treatment methods of building recycled concrete aggregates[J]. Materials Reports, 2022, 36(21): 88-95 (in Chinese).
[6] 李强, 王志兵, 叶万涛, 等. 水泥混凝土路面板再生集料工程特性强化方法[J]. 江苏大学学报(自然科学版), 2019, 40(3): 350-354+365.
LI Q, WANG Z B, YE W T, et al. Strengthening method of engineering properties for recycled aggregates from cement concrete pavement slabs[J]. Journal of Jiangsu University (Natural Science Edition), 2019, 40(3): 350-354+365 (in Chinese).
[7] DILBAS H, ÇAKıR Ö, YıLDıRıM H. An experimental investigation on fracture parameters of recycled aggregate concrete with optimized ball milling method[J]. Construction and Building Materials, 2020, 252: 119118.
[8] MA K L, HUANG X Y, SHEN J T, et al. The morphological characteristics of brick-concrete recycled coarse aggregate based on the digital image processing technique[J]. Journal of Building Engineering, 2021, 44: 103292.
[9] 申景涛, 黄新宇, 马昆林, 等. 基于主成分分析的物理整形对再生粗骨料形貌特征影响的研究[J]. 铁道科学与工程学报, 2025, 22(3): 1112-1120.
SHEN J T, HUANG X Y, MA K L, et al. Influence of physical shaping on morphological characteristics of recycled coarse aggregates based on principal component analysis[J]. Journal of Railway Science and Engineering, 2025, 22(3): 1112-1120 (in Chinese).
[10] ARAUJO V M C, BESSA I S, CASTELO BRANCO V T F. Measuring skid resistance of hot mix asphalt using the aggregate image measurement system (AIMS)[J]. Construction and Building Materials, 2015, 98: 476-481.
[11] 苏栋, 吴炯, 肖政健, 等. 基于三维扫描和球谐分析的骨料和再生骨料颗粒形状表征[J]. 沈阳建筑大学学报(自然科学版), 2020, 36(5): 827-835.
SU D, WU J, XIAO Z J, et al. Geometrical characterization of natural and recycled aggregate particles based on 3D scanning and spherical harmonic analyses[J]. Journal of Shenyang Jianzhu University (Natural Science), 2020, 36(5): 827-835 (in Chinese).
[12] PADMINI A K, RAMAMURTHY K, MATHEWS M S. Influence of parent concrete on the properties of recycled aggregate concrete[J]. Construction and Building Materials, 2009, 23(2): 829-836.
[13] CHAKRADHARA RAO M. Properties of recycled aggregate and recycled aggregate concrete: effect of parent concrete[J]. Asian Journal of Civil Engineering, 2018, 19(1): 103-110.
[14] BELIN P, HABERT G, THIERY M, et al. Cement paste content and water absorption of recycled concrete coarse aggregates[J]. Materials and Structures, 2014, 47(9): 1451-1465.
[15] LIU J, MA K L, SHEN J T, et al. Influence of recycled concrete aggregate enhancement methods on the change of microstructure of ITZs in recycled aggregate concrete[J]. Construction and Building Materials, 2023, 371: 130772.
[16] DUAN Z H, ZHAO W J, YE T H, et al. Measurement of water absorption of recycled aggregate[J]. Materials, 2022, 15(15): 5141.
[17] 许开成, 王文鹏, 张立卿. 不同来源粗骨料混合再生混凝土抗压强度及其预测模型建立[J/OL]. 材料导报, 2024: 1-19 (2024-09-10)[2025-02-10]. http://kns.cnki.net/kcms/detail/50.1078.TB.20240910.1148.012.html.
XU K C, WANG W P, ZHANG L Q. Establishment of compressive strength and prediction model of mixed recycled concrete with coarse aggregate from different sources[J/OL]. China Industrial Economics, 2024: 1-19 (2024-09-10)[2025-02-10]. http://kns.cnki.net/kcms/detail/50.1078.TB.20240910.1148.012.html (in Chinese).
[18] CHEN Y C, CHEN C H, CAI Z Y, et al. Effect of strength of parent concrete on utilization of recycled aggregate concrete: a review[J]. Journal of Building Engineering, 2025, 103: 112187.
[19] ZHAO Y, DUAN Y H, ZHU L L, et al. Characterization of coarse aggregate morphology and its effect on rheological and mechanical properties of fresh concrete[J]. Construction and Building Materials, 2021, 286: 122940.
[20] 张雪芹, 马昆林, 龙广成, 等. 粗骨料形态特征表征参数及其与混凝土性能关系的研究进展[J]. 材料导报, 2024, 38(2): 118-129.
ZHANG X Q, MA K L, LONG G C, et al. Research progress in characterization parameters of coarse aggregate morphology and its relationship with concrete properties[J]. Materials Reports, 2024, 38(2): 118-129 (in Chinese).
[21] 王忠星, 姚宏, 李秋义, 等. 再生粗骨料强化处理方式对再生混凝土抗碳化性能的影响[J]. 混凝土, 2017(9): 57-60.
WANG Z X, YAO H, LI Q Y, et al. Effect of enhanced processing mode properties of recycled coarse aggregate on the carbonation resistance of recycled concrete[J]. Concrete, 2017(9): 57-60 (in Chinese).