粉煤灰掺量对全再生粗骨料自密实混凝土工作性能的影响

doi:10.16552/j.cnki.issn1001-1625.20241118.001

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (2): 531-539.DOI: 10.16552/j.cnki.issn1001-1625.20241118.001

粉煤灰掺量对全再生粗骨料自密实混凝土工作性能的影响

陈祥花¹, 劳国威², 郑述芳¹, 宁璠³, 许瑞天², 陈宗平²

1.广西农业职业技术大学城乡建设学院,南宁 530007;
2.广西大学土木建筑工程学院,南宁 530004;
3.广西职业师范学院土木建筑工程学院,南宁 530007

收稿日期:2024-04-19 修订日期:2024-06-03 出版日期:2025-02-15 发布日期:2025-02-28
通信作者: 陈宗平,博士,教授。E-mail:zpchen@gxu.edu.cn
作者简介:陈祥花(1984—),女,讲师。主要从事混凝土材料方面的研究。E-mail:yanyu840301@163.com
基金资助:
国家自然科学基金(51578163);广西重点研发计划项目(桂科AB21220012);中央引导地方科技发展资金项目(桂科ZY21195010));广西高校中青年教师科研基础能力提升项目(2023KY1225);广西农业职业技术大学科学研究与技术开发计划课题(YKJ2206);广西农业科技自筹经费项目(Z202232);广西研究生教育创新计划项目

Effect of Fly Ash Content on Workability of Fully Recycled Coarse Aggregate Self-Compacting Concrete

CHEN Xianghua¹, LAO Guowei², ZHENG Shufang¹, NING Fan³, XU Ruitian², CHEN Zongping²

1. Urban-Rural Construction College, Guangxi Vocational University of Agriculture, Nanning 530007, China;
2. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
3. School of Civil and Architectural Engineering, Guangxi Vocational Normal University, Nanning 530007, China

Received:2024-04-19 Revised:2024-06-03 Published:2025-02-15 Online:2025-02-28

摘要/Abstract

摘要： 为制备满足工作性能要求的全再生粗骨料自密实混凝土,以粉煤灰掺量(20%、30%、40%、50%、70%,质量分数)和水胶比(0.36、0.40、0.45)为设计变量,制备了11组全再生粗骨料自密实混凝土拌合物,对其开展了坍落扩展度、流动时间T₅₀₀和J环扩展度等工作性能试验,分析了粉煤灰掺量和水胶比对全再生粗骨料自密实混凝土工作性能的影响规律。结果表明:掺入适量的粉煤灰可提高全再生粗骨料自密实混凝土的流动性能,当粉煤灰掺量达到30%时,混凝土坍落扩展度最大可达到755.0 mm;当粉煤灰掺量从20%增大到40%时,混凝土的填充性能呈下降趋势,离析率呈先减小后增大的趋势,建议全再生粗骨料自密实混凝土合理粉煤灰掺量为20%~30%。基于试验结果,建立了适用于全再生粗骨料自密实混凝土坍落扩展度的非线性回归模型,计算值与试验值吻合较好。

关键词: 再生粗骨料混凝土, 自密实混凝土, 粉煤灰, 水胶比, 工作性能, 坍落扩展度

Abstract: In order to prepare fully recycled coarse aggregate self-compacting concrete that meets the requirements of workability, 11 groups of fully recycled coarse aggregate self-compacting concrete mixtures were prepared with fly ash content (20%, 30%, 40%, 50%, 70%, mass fraction) and water-binder ratio (0.36, 0.40, 0.45) as design variables. The workability tests such as slump expansion, flow time T₅₀₀ and J-ring expansion were carried out, and the effects of fly ash content and water-binder ratio on the workability of fully recycled coarse aggregate self-compacting concrete were analyzed. The results show that the fluidity of fully recycled coarse aggregate self-compacting concrete can be improved by adding appropriate amount of fly ash. When the content of fly ash reaches 30% (mass fraction), the slump expansion of concrete reaches 755.0 mm. When the content of fly ash increases from 20% to 40%, the filling performance of concrete decreases, and the segregation rate decreases first and then increases. It is suggested that the reasonable content of fly ash in fully recycled coarse aggregate self-compacting concrete is 20%~30%. Based on the experimental results, a nonlinear regression model for the slump expansion of fully recycled coarse aggregate self-compacting concrete is established, and the calculated values are in good agreement with the experimental values.

Key words: recycled coarse aggregate concrete, self-compacting concrete, fly ash, water-binder ratio, workability, slump expansion

中图分类号:

TU528.041

陈祥花, 劳国威, 郑述芳, 宁璠, 许瑞天, 陈宗平. 粉煤灰掺量对全再生粗骨料自密实混凝土工作性能的影响[J]. 硅酸盐通报, 2025, 44(2): 531-539.

CHEN Xianghua, LAO Guowei, ZHENG Shufang, NING Fan, XU Ruitian, CHEN Zongping. Effect of Fly Ash Content on Workability of Fully Recycled Coarse Aggregate Self-Compacting Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(2): 531-539.

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粉煤灰掺量对全再生粗骨料自密实混凝土工作性能的影响

Effect of Fly Ash Content on Workability of Fully Recycled Coarse Aggregate Self-Compacting Concrete

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