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
投稿时间:2021-09-09  修订日期:2022-06-21
DOI:
中文关键词:  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
英文关键词:Sporosarcina pasteurii  microbial cement  carbonate precipitation  capillary water absorption coefficient  bond strength
基金项目:中国水科院基本科研业务费项目(SM0145B022021)
作者单位邮编
马锋玲 中国水利水电科学研究院材料研究所 100038
李文培 中国人民解放军91053部队 
徐耀 中国水利水电科学研究院材料研究所 100038
王建平 中国人民解放军91053部队 
贾保治 中国水利水电科学研究院 
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中文摘要:
      本研究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,可满足实际工程的要求。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。
英文摘要:
      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 were all covered by carbonate precipitation by using high power concentrated bacteria liquid for many times, and the film covering layer was thick. The surface capillary water absorption coefficient of concrete was significantly reduced after restoration, reduction rate was basically more than 90%. The repair and protection effect was significant. The result shows that the thickness of the repaired layer is above 0.3mm, the bond strength at the interface of the repaired layer is up to 2.19MPa which can satisfy the engineering requirements. It can be seen that microbial cement is suitable for the repair and protection of concrete surface and micro-cracks (width less than 0.2mm). The repair effect can be characterized by the capillary water absorption coefficient and the bond strength of repair interface layer.
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