- 目录
- 混凝土与制品
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环境湿度对微生物诱导碳酸钙沉积技术修复混凝土裂缝的影响研究
作者：高瑞晓1，马金虎1，陈华宇1，范冬冬2，王剑云1
（1．西安交通大学 人居环境与建筑工程学院，陕西 西安 710049；
2.安徽中铁工程材料科技有限公司，安徽 合肥 230041）
2.安徽中铁工程材料科技有限公司，安徽 合肥 230041）
摘要：由于混凝土在湿度较大环境下更容易受有害介质的侵蚀，导致混凝土结构破坏，严重时引起安全事故。因此，研究了不同湿度条件下微生物诱导碳酸钙沉积（MICP）技术对既有混凝土裂缝的修复效果。结果表明：10 d后0.3 mm和0.5 mm的裂缝表面均能愈合；相对湿度较高的环境下（80%），裂缝宽度为0.5 mm试件修复后毛细吸水率降低了40%，抗压强度恢复率达92.2%。裂缝宽度为0.3 mm的试件修复后碳酸钙分布优于裂缝宽度0.5 mm试件。微观分析可知，生物碳酸钙对试件裂缝修复后的抗渗性和强度均有较大贡献。
关键词：微裂缝；生物碳酸钙；湿度条件；毛细吸水；强度恢复
中图分类号：TU57+9 文献标识码：A 文章编号：1001-702X（2023）04-0038-05
Study on the effect of environmental humidity on microbial induced carbonate precipitation technology for repairing concrete cracks
GAO Ruixiao1，MA Jinhu1，CHEN Huayu1，FAN Dongdong2，WANG Jianyun1
（1.School of Human Settlements and Civil Engineering，Xi'an Jiaotong University，Xi'an 710049，China；
2.Anhui Engineering Material Technology Co. Ltd. of CTCE Group，Hefei 230041，China）
Abstract：The concrete were more vulnerable to the erosion of harmful media in an environment of high humidity，resulting in the destruction of concrete structures，and serious safety accidents. Therefore，the repair effect of microbial induced calcium carbonate deposition（MICP） technology on existing concrete cracks under different humidity conditions was studied. The results show that both 0.3 mm and 0.5 mm crack surfaces can be healed after 10 days. When the relative humidity is higher than 80%RH，the capillary water absorption of the sample with a crack width of 0.5 mm after repair is reduced by 40%，and the recovery rate of compressive strength is up to 92.2%. The distribution of calcium carbonate in the sample with a crack width of 0.3 mm after the repair is better than that in the sample with a crack width of 0.5 mm. Microscopic analysis shows that biological calcium carbonate has a great contribution to the impermeability and strength of the sample after crack repair.
Key words：micro-cracks，biological calcium carbonate，humidity conditions，capillary water absorption，strength recovery