期刊
SUSTAINABILITY
卷 13, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/su13094834
关键词
microbial-induced calcium carbonate precipitation; Bacillus; biomineralization; self-healing mortar; vaterite morphology
资金
- National Natural Science Foundation of China [11902161]
- Natural Science Foundation of Jiangsu Province [BK20170824]
The research on ureolytic microbial-induced calcium carbonate precipitation (MICP) in self-healing mortar under artificial seawater conditions showed promising results for crack repair. The addition of polyvinyl alcohol fiber was found to enhance the performance of self-healing mortar.
Ureolytic microbial-induced calcium carbonate precipitation (MICP) is a promising green technique for addressing sustainable building concerns by promoting self-healing mortar development. This paper deals with bacteria-based self-healing mortar under artificial seawater incubation for the sake of fast crack sealing with sufficient calcium resource supply. The ureolytic MICP mechanism was explored by morphology characterization and compositional analysis. With polyvinyl alcohol fiber reinforcement, self-healing mortar beams were produced and bent to generate 0.4 mm width cracks at the bottom. The crack-sealing capacity was evaluated at an age of 7 days, 14 days, and 28 days, suggesting a 1-week and 2-week healing time for 7-day- and 14-day-old samples. However, the 28-day-old ones failed to heal the cracks completely. The precipitation crystals filling the crack gap were identified as mainly vaterite with cell imprints. Moreover, fiber surface was found to be adhered by bacterial precipitates indicating fiber-matrix interfacial bond repair.
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