基于微生物矿化沉积的混凝土裂缝修复研究进展

Research progress of concrete crack remediation based on microbially mineral precipitation

针对混凝土开裂工程难题,提出采用微生物矿化沉积材料进行裂缝修复的方法.详细讨论微生物矿化沉积的机理、修复剂各组分与混凝土基体的相互作用、修复后混凝土的强度和耐久性能这3个在裂缝修复中的关键技术问题,并探讨相应的最新进展.分析结果表明,沉积产物主要为碳酸钙矿物,且其修复的首要方面为改善混凝土的耐久性.当前亟待解决的问题包括微生物的有效保护、修复效率、经济性以及环境影响方面.结合实际应用前景,可预见智能化自修复是微生物修复技术未来重要的研究方向之一.

Microbially mineralized precipitation material was proposed for the remediation of concrete cracking,which is regarded as a big challenge in engineering.Three key points in the main research fields including mechanism of microbially mineralized precipitation,interaction among components of microbial remediator and concrete matrix,and strength and durability properties of concrete after remediation were discussed in detail,along with the investigation on the latest developments.Analysis results show that the precipitation mineral is mainly calcium carbonate,and the repair work improves the durability of concrete primarily.The imperative issues at present are the effective protection of bacteria in concrete,speed and economical efficiency of remediation,and environmental influence.Considering the possibility of practical application,it can be foreseen that bacteria-based intelligent self-repair would be one of the most promising trend in future research.