PMID- 29487987
OWN - NLM
STAT- MEDLINE
DCOM- 20180921
LR  - 20181004
IS  - 1432-0614 (Electronic)
IS  - 0175-7598 (Linking)
VI  - 102
IP  - 7
DP  - 2018 Apr
TI  - Current challenges and future directions for bacterial self-healing concrete.
PG  - 3059-3070
LID - 10.1007/s00253-018-8830-y [doi]
AB  - 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 
      involved in MICP, the specific microorganisms suitable for application in 
      concrete, the survival characteristics of the microorganisms embedded in 
      concrete, and the amount of MICP in concrete, remain unclear. In this paper, 
      metabolic pathways that result in conditions favorable for calcium carbonate 
      precipitation, current and potential applications in concrete, and the remaining 
      biological challenges are reviewed.
FAU - Lee, Yun Suk
AU  - Lee YS
AD  - Laboratory of Molecular Environmental Microbiology, Department of Environmental 
      Science and Ecological Engineering, Korea University, Seoul, 02841, Republic of 
      Korea.
FAU - Park, Woojun
AU  - Park W
AD  - Laboratory of Molecular Environmental Microbiology, Department of Environmental 
      Science and Ecological Engineering, Korea University, Seoul, 02841, Republic of 
      Korea. wpark@korea.ac.kr.
LA  - eng
GR  - 18SCIP-B103706-04/Ministry of Land, Infrastructure and Transport of Korean 
      government/
PT  - Journal Article
PT  - Review
DEP - 20180227
PL  - Germany
TA  - Appl Microbiol Biotechnol
JT  - Applied microbiology and biotechnology
JID - 8406612
RN  - H0G9379FGK (Calcium Carbonate)
SB  - IM
MH  - Bacteria/*metabolism
MH  - Calcium Carbonate/*metabolism
MH  - *Construction Materials
MH  - Industrial Microbiology/*trends
OTO - NOTNLM
OT  - Bacterial encapsulation
OT  - Calcium carbonate precipitation
OT  - MICP
OT  - Microbial activity
OT  - Self-healing assessment
OT  - Self-healing concrete
EDAT- 2018/03/01 06:00
MHDA- 2018/09/22 06:00
CRDT- 2018/03/01 06:00
PHST- 2017/11/09 00:00 [received]
PHST- 2018/01/31 00:00 [accepted]
PHST- 2018/01/29 00:00 [revised]
PHST- 2018/03/01 06:00 [pubmed]
PHST- 2018/09/22 06:00 [medline]
PHST- 2018/03/01 06:00 [entrez]
AID - 10.1007/s00253-018-8830-y [pii]
AID - 10.1007/s00253-018-8830-y [doi]
PST - ppublish
SO  - Appl Microbiol Biotechnol. 2018 Apr;102(7):3059-3070. doi: 
      10.1007/s00253-018-8830-y. Epub 2018 Feb 27.