微生物矿化修复混凝土表面缺陷的现场试验  

Field experiment of repairing concrete surface defects by microbial mineralization

作　　者：马锋玲[1] 李文培 徐耀[1] 王建平 贾保治 MA Fengling;LI Wenpei;XU Yao;WANG Jianping;JIA Baozhi(Department of Materials,China Institute of Water Resources and Hydropower Research,Bejing 100038,China;91053 Troops,People's Liberation Army of China,Beijing 100070,China)

机构地区：[1]中国水利水电科学研究院材料研究所,北京100038 [2]中国人民解放军91053部队,北京100070

出　　处：《中国水利水电科学研究院学报（中英文）》2022年第5期411-421,共11页Journal of China Institute of Water Resources and Hydropower Research

基　　金：国家自然科学基金项目(51879286);中国水科院基本科研业务费项目(SM0145B022021)。

摘　　要：利用混凝土表面对微生物菌体的吸附特性富集菌体,最终在混凝土表面沉积得到致密碳酸钙覆膜层,达到对混凝土表面的修复防护。通过毛细吸水系数测试、修复层界面黏结强度测试、取芯观察、微观检测等方法对微生物水泥修复防护效果进行了综合评价,并给出了修复效果的表征方法及指标。试验研究表明,采用高倍浓缩菌液多次涂覆后,混凝土表面及裂缝均已被沉积的碳酸钙全部覆盖,覆膜层较厚,坚硬、密实。修复后混凝土表面毛细吸水系数明显降低,降低率可达90%以上,修复防护效果显著。经测试,修复层厚度在0.3mm以上,修复层界面黏结强度最高达2.19MPa。可见,微生物水泥适用于混凝土表面及微裂缝(缝宽小于0.2mm)的修复防护,修复效果可采用毛细吸水系数和修复层界面黏结强度表征。In this study, microbial cement was used to enrich bacteria on the concrete surface and provide a surface environment suitable for mineralization.Finally, dense calcium carbonate film was deposited on the concrete surface to achieve repair and protection of the concrete surface.The repair effect of microbial cement was comprehensively evaluated through the capillary water absorption coefficient, bond strength testing of repaired layer interface, coring observation and microscopic detection.The characterization method and “evaluation” index of repair effect are given.The experimental results show that the concrete surface and cracks are all covered by carbonate precipitation by using high power concentrated bacteria liquid for many times, and the film covering layer is thick.The surface capillary water absorption coefficient of concrete is significantly reduced after restoration, reduction rate is basically more than 90%.The repair and protection effect is significant.The result shows that the thickness of the repaired layer is above 0.3 mm, the bond strength at the interface of the repaired layer is up to 2.19 MPa.It can be seen that microbial cement is suitable for the repair and protection of concrete surface and micro-cracks(width less than 0.2 mm).The repair effect can be characterized by the capillary water absorption coefficient and the bond strength of repair interface layer.

关 键 词：巴氏芽孢八叠球菌 微生物水泥 碳酸钙沉积 毛细吸水系数 黏结强度 

分 类 号：TV431[水利工程—水工结构工程]