Ureolytic MICP-Based Self-Healing Mortar under Artificial Seawater Incubation

Xichen Sun, Jie Chen, Siyi Lu, Miaomiao Liu, Siyu Chen, Yifei Nan, Yang Wang and Jun Feng
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Xichen Sun: National Key Laboratory of Transient Physics, Nanjing University of Science & Technology, Nanjing 210094, China
Jie Chen: School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
Siyi Lu: School of Science, Nanjing University of Science & Technology, Nanjing 210094, China
Miaomiao Liu: School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
Siyu Chen: School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
Yifei Nan: School of Science, Nanjing University of Science & Technology, Nanjing 210094, China
Yang Wang: School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, China
Jun Feng: National Key Laboratory of Transient Physics, Nanjing University of Science & Technology, Nanjing 210094, China

Sustainability, 2021, vol. 13, issue 9, 1-11

Abstract: 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.

Keywords: microbial-induced calcium carbonate precipitation; Bacillus; biomineralization; self-healing mortar; vaterite morphology (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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