Current challenges and future directions for bacterial self-healing concrete

Applied Microbiology and Biotechnology
Yun Suk Lee, Woojun Park

Abstract

Microbially induced calcium carbonate precipitation (MICP) has been widely explored and applied in the field of environmental engineering over the last decade. Calcium carbonate is naturally precipitated as a byproduct of various microbial metabolic activities. This biological process was brought into practical use to restore construction materials, strengthen and remediate soil, and sequester carbon. MICP has also been extensively examined for applications in self-healing concrete. Biogenic crack repair helps mitigate the high maintenance costs of concrete in an eco-friendly manner. In this process, calcium carbonate precipitation (CCP)-capable bacteria and nutrients are embedded inside the concrete. These bacteria are expected to increase the durability of the concrete by precipitating calcium carbonate in situ to heal cracks that develop in the concrete. However, several challenges exist with respect to embedding such bacteria; harsh conditions in concrete matrices are unsuitable for bacterial life, including high alkalinity (pH up to 13), high temperatures during manufacturing processes, and limited oxygen supply. Additionally, many biological factors, including the optimum conditions for MICP, the molecular mechanisms invo...Continue Reading

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Citations

Feb 28, 2020·The Journal of Microbiology·Youngung RyuWoojun Park
Aug 30, 2019·Scientific Reports·Wiboonluk PungrasmiSuched Likitlersuang
Mar 23, 2019·World Journal of Microbiology & Biotechnology·Diana P Tamayo-FigueroaPedro F B Brandão
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Jun 3, 2021·Materials·Ronaldas JakubovskisJaunius Urbonavičius
Nov 12, 2021·The Science of the Total Environment·Jiayue ZhaoGeoffrey Michael Gadd

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Methods Mentioned

BETA
deamination
nuclear magnetic resonance
NMR

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