三种微生物矿化修复再生混凝土裂缝效果对比分析

doi:10.11896/cldb.23120160

材料导报

2025, Vol. 39

Issue (2): 23120160-8 https://doi.org/10.11896/cldb.23120160

无机非金属及其复合材料

三种微生物矿化修复再生混凝土裂缝效果对比分析

李克亮¹, 颜辰¹, 陈希¹, 陈爱玖¹, 杜晓蒙², 李伟华^1,*

1 华北水利水电大学土木与交通学院,郑州 450045
2 郑州鼎盛高新能源工程技术有限公司,郑州 450001

Comparative Analysis of the Repair Effect of Three Methods of Microbial Induced Calcium Carbonate Precipitation on Recycled Aggregate Concrete Cracks

LI Keliang¹, YAN Chen¹, CHEN Xi¹, CHEN Aijiu¹, DU Xiaomeng², LI Weihua^1,*

1 College of Civil Engineering and Transportation, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
2 Zhengzhou Dingsheng High Tech Energy Engineering Technology Co., Ltd., Zhengzhou 450001, China

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摘要为获得微生物诱导碳酸钙沉淀(MICP)修复混凝土裂缝的较好技术方案,确定了巨大芽孢杆菌的最佳生长条件,研究了注射法、琼脂固载微生物法以及再生骨料固载微生物法对再生混凝土裂缝的修复效果,对比分析了三种修复方案下的最大修复裂缝宽度、面积修复率、渗透系数降低率、沉积深度及沉积产物的微观形貌和组成。研究表明:修复28 d后,采用琼脂固载微生物法时表面最大修复裂缝宽度为0.66 mm,大于采用注射法和再生骨料固载微生物法的0.29 mm、0.56 mm;在修复早期,采用琼脂固载微生物法在面积修复率和渗透系数降低率方面显著优于另外两种修复方式;再生骨料固载微生物法产生了较大的沉积深度,琼脂固载微生物法则更多在表面产生沉积产物;MICP修复混凝土裂缝的填充物为方解石型CaCO₃。因此,采用MICP技术修复再生混凝土微裂缝是有效的,且合适的固载方式可以显著提升微生物修复再生混凝土裂缝效果。

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关键词: 再生混凝土裂缝修复微生物微观形貌

Abstract: To obtain better technical solution of microbial induced calcium carbonate precipitation (MICP) to repair recycled aggregate concrete cracks, the optimum growth conditions of Bacillus megaterium were determined. Three methods of injection, agar immobilization and recycled aggregate immobilization with Bacillus megaterium were used. Comparative analyses of the maximum repair crack width, the area repair rate, reduction rate of permeability coefficient, deposition depth, micro morphology and composition of the deposited product were carried out under three methods. Theresults show that after repairing for 28 d, the maximum repair crack width uisng agar immobilization method is 0.66 mm, which is larger than 0.56 mm and 0.29 mm using the recycled aggregate immobilization method and the injection method, respectively. At the same time, the area repair rate and the reduction rate of permeability coefficient using agar immobilization method in the early stage are larger than that of the other two repair methods. Deposition depth using recycled aggregate immobilization method is the largest, and it is the smallest using agar immobilization method. The filling material from MICP to repair concrete cracks is proved to be calcite. MICP technology is effective to repair recycled aggregate concrete cracks, and appropriate immobilization method can significantly improve the MICP repair efficiency.

Key words: recycled aggregate concrete crack repair microbial micro morphology

出版日期: 2025-01-25 发布日期: 2025-01-21

ZTFLH:

TU528

基金资助: 国家自然科学基金面上项目(52179133);河南省科技攻关项目(222102320131)

通讯作者: ^*李伟华,二级教授,博士研究生导师,国家杰出青年科学基金获得者,欧洲自然科学院外籍院士,国家“万人计划”创新领军人才,英国皇家化学会会士,科技部中青年创新领军人才,新世纪巾帼发明家,河南省基础设施腐蚀防控重点实验室主任。主研领域为钢筋混凝土材料与结构腐蚀防控,提出了钢结构防腐涂层损伤多模式自修复理论、纳米负载自催化钢筋靶向阻锈理论,研发了多机制协同作用涂层损伤多尺度自修复和靶向阻锈剂技术,成果应用于港珠澳大桥、胶州湾跨海大桥等重大工程项目。liweihua@ncwu.edu.cn

作者简介: 李克亮,博士,华北水利水电大学教授、硕士研究生导师。主要从事低碳生态建筑材料、固体废弃物资源化利用、高性能无机胶凝材料及其混凝土的研究。

引用本文:

李克亮, 颜辰, 陈希, 陈爱玖, 杜晓蒙, 李伟华. 三种微生物矿化修复再生混凝土裂缝效果对比分析[J]. 材料导报, 2025, 39(2): 23120160-8.
LI Keliang, YAN Chen, CHEN Xi, CHEN Aijiu, DU Xiaomeng, LI Weihua. Comparative Analysis of the Repair Effect of Three Methods of Microbial Induced Calcium Carbonate Precipitation on Recycled Aggregate Concrete Cracks. Materials Reports, 2025, 39(2): 23120160-8.

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https://www.mater-rep.com/CN/10.11896/cldb.23120160 或 https://www.mater-rep.com/CN/Y2025/V39/I2/23120160

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