| 摘要: |
| 为了解决微生物诱导碳酸钙沉淀（MICP）技术对于裂缝深层区域难以充分修复的问题,试验采用巴氏芽孢杆菌（Sporosarcina pasteurii）作为微生物菌种,并在修复液中添加了微生物生长液（包括葡萄糖和氧气）,采用不同的修复工艺对混凝土深层处的裂缝进行修复,并以裂缝表观形貌、裂缝深度和混凝土透水性3个指标评价修复效果,进一步结合扫描电子显微镜-能谱仪（SEM-EDS）微观分析对其反应产物进行分析.结果表明,在MICP修复过程中添加微生物生长液,能够在裂缝深处无氧环境下为微生物提供生长代谢的条件,使矿化反应得以正常进行,从而充分填补裂缝深层区域. |
| 关键词: 混凝土 微生物 裂缝 深度修复 |
| DOI：10.20192/j.cnki.JSHNU(NS).2024.06.011 |
| 分类号:TU528.1 |
| 基金项目:同济大学交通行业重点实验室开放课题（KLWRTBMC19-02） |
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| Research on microbial mineralization repair technology for deep cracks in concrete |
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WU Liushen1, HE Maolin2, CAO Huan3, ZHU Ziqian3, WANG Tong1
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1.School of Civil Engineering, Shanghai Normal University, Shanghai 201418, China;2.School of Naval Architecture and Maritime, Zhejiang Ocean University, Zhoushan 316004, Zhejiang, China;3.Shanghai Urban Construction Vocational College, Shanghai 200438, China
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| Abstract: |
| In order to solve the problem of microbially induced calcium carbonate precipitation （MICP） technology for the crack deep area which was difficult to repair adequately, the Sporosarcina pasteurii was used as a microbial strain. Besides, microbial growth solution （including glucose and oxygen） was added in the repair liquid, and different repair processes were adopted to repair the cracks in the deep layer of concrete, and the repair effect was evaluated by three indexes： the apparent morphology of the cracks, the depth of the cracks and the water permeability of the concrete. Furthermore, the repair effect was analyzed by combining with the SEM-EDS （scanning electron microscopy-energy dispersive spectrometer） to analyze the reaction products. The results showed that the addition of microbial growth solution in the MICP repair process could provide conditions for microbial growth and metabolism in the anaerobic environment deep in the cracks, so that the mineralization reaction could be carried out normally, which could fill the deep area of the cracks adequately. |
| Key words: concrete microbial crack deep repair |
