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Current challenges and future directions for bacterial self-healing concrete
1Laboratory of Molecular Environmental Microbiology, Department of Environmental Science and Ecological Engineering, Korea University, Seoul, 02841, Republic of Korea.
Applied Microbiology and Biotechnology
|March 1, 2018
Summary
Microbially induced calcium carbonate precipitation (MICP) offers eco-friendly solutions for construction, particularly in self-healing concrete. Challenges remain in ensuring bacterial survival and optimizing MICP within harsh concrete environments.
Area of Science:
- Environmental Engineering
- Microbiology
- Materials Science
Background:
- Microbially induced calcium carbonate precipitation (MICP) is a biological process where microbes precipitate calcium carbonate.
- MICP is utilized in environmental engineering for material restoration, soil stabilization, carbon sequestration, and self-healing concrete.
- Biogenic crack repair in concrete uses MICP-capable bacteria and nutrients to enhance durability and reduce maintenance costs.
Purpose of the Study:
- To review metabolic pathways enabling calcium carbonate precipitation (CCP).
- To discuss current and potential applications of MICP in concrete.
- To identify and analyze the biological challenges hindering MICP implementation in concrete.
Main Methods:
- Review of metabolic pathways conducive to calcium carbonate precipitation.
- Analysis of existing and prospective applications of MICP in concrete technology.
- Identification and discussion of biological hurdles for bacteria in concrete matrices.
Main Results:
- MICP is a viable method for eco-friendly applications in construction and environmental remediation.
- Embedding bacteria in concrete for self-healing presents significant challenges due to harsh concrete conditions (high pH, temperature, low oxygen).
- Critical biological factors like optimal MICP conditions, molecular mechanisms, suitable microorganisms, and bacterial survival in concrete require further investigation.
Conclusions:
- MICP holds promise for sustainable construction, especially for self-healing concrete.
- Overcoming the harsh conditions within concrete is crucial for successful bacterial integration and MICP efficacy.
- Further research into biological aspects is essential to fully realize the potential of MICP in concrete applications.
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