水力发电学报2024，Vol.43Issue(6)：1-10,10.DOI:10.11660/slfdxb.20240601
水工混凝土矿化微生物固载及自修复试验研究
Experimental study on mineralized microbial immobilization and self-healing of hydraulic concrete
摘要
Abstract
Preparation of microbial self-healing concrete by direct internal mixing will affect the long-term activity of mineralized microorganisms due to factors such as squeezing friction and limited living environment.In this work,we select Bacillus pasteurii as a mineralized microorganism,and use expanded perlite and ceramsite as microbial carriers,and cement slurry and metakaolin slurry as carrier coating materials.An experiment is conducted to optimize the carrier and its reasonable particle size and coating materials that contribute to the release and protection of the microorganism;the effect of microbial immobilization on the self-healing effect of cracks is studied.The results show that quantitative expanded perlite,added to a hydraulic concrete specimen,increases the tensile crack ratio at its splitting crack;as a microbial immobilization material,it is more effective to release mineralized microorganisms than ceramsite.Metakaolin slurry is more suitable as a carrier coating material than cement slurry,and its encapsulation of the microorganism achieves a 14-day survival rate of 86.6%,effectively ensuring the long-term activity of the immobilized microorganism.The microorganism that are immobilized with expanded perlite and coated with metakaolin slurry can achieve a 90-day repair and maintenance effect of the cracks up to a width of 0.616 mm,wider than 0.453 mm of the direct addition method.Thus,our method effectively improves the crack self-healing effect of concrete specimens.关键词
水工混凝土/矿化微生物/固载/包覆材料/裂缝自修复Key words
hydraulic concrete/mineralized microbial/immobilization/coating material/crack self-repairing分类
水利科学引用本文复制引用
孟永东,薛玉,何竹青,徐晓蔚,蔡征龙,田斌..水工混凝土矿化微生物固载及自修复试验研究[J].水力发电学报,2024,43(6):1-10,10.基金项目
国家自然科学基金面上项目(52179137) （52179137）
