微生物自修复混凝土载体材料研究进展

The occurrence of micro-cracks can cause serious degradation of concrete performance. So crack repair is of great significance. The self-repair technology based on Microbially Induced Carbonate Precipitation (MICP) is an environmentally friendly, long-term feasible remediation method that has attracted much attentions. For microbial based self-healing concrete, the capacity of microbial mineralization directly determines the efficiency of self-healing. While the microbial carrier acts as a ‘protective shell’ to provide sufficient space for microbial metabolism, carrier materials have significantly increased the ability of microbial to withstand extreme environment, thus ensuring the realization of the self-repair effect. In this article, the research results of carrier materials used in microbial self-healing concrete systems at home and abroad are systematically introduced. The working mechanism of microbial self-healing concrete are expounded and summarized, the research progress of different carrier materials such as porous carrier, closed carrier, nano carrier materials, and bacteria themselves as carrier are discussed and compared, the patent conversion and engineering application of carrier materials are analyzed, and the existing problems are pointed out. Finally, the application prospects of different carrier materials in microbial based self-healing concrete are prospected, aiming to provide some guidance and suggestions for the application of this technology.