PMID- 31817964
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20200928
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 12
IP  - 24
DP  - 2019 Dec 8
TI  - Self-Healing Concrete by Biological Substrate.
LID - 10.3390/ma12244099 [doi]
LID - 4099
AB  - At present, the commonly used repair materials for concrete cracks mainly include 
      epoxy systems and acrylic resins, which are all environmentally unfriendly 
      materials, and the difference in drying shrinkage and thermal expansion often 
      causes delamination or cracking between the original concrete matrix and the 
      repair material. This study aimed to explore the feasibility of using microbial 
      techniques to repair concrete cracks. The bacteria used were environmentally 
      friendly Bacillus pasteurii. In particular, the use of lightweight aggregates as 
      bacterial carriers in concrete can increase the chance of bacterial survival. 
      Once the external environment meets the growth conditions of the bacteria, the 
      vitality of the strain can be restored. Such a system can greatly improve the 
      feasibility and success rate of bacterial mineralization in concrete. The test 
      project included the microscopic testing of concrete crack repair, mainly to 
      understand the crack repair effect of lightweight aggregate concrete with 
      implanted bacterial strains, and an XRD test to confirm that the repair material 
      was produced by the bacteria. The results show that the implanted bacterial 
      strains can undergo Microbiologically Induced Calcium Carbonate Precipitation 
      (MICP) and can effectively fill the cracks caused by external concrete forces by 
      calcium carbonate deposition. According to the results on the crack profile and 
      crack thickness, the calcium carbonate precipitate produced by the action of 
      Bacillus pasteurii is formed by the interface between the aggregate and the 
      cement paste, and it spreads over the entire fracture surface and then 
      accumulates to a certain thickness to form a crack repairing effect. The analysis 
      results of the XRD test also clearly confirm that the white crystal formed in the 
      concrete crack is calcium carbonate. From the above test results, it is indeed 
      feasible to use Bacillus pasteurii in the self-healing of concrete cracks.
FAU - Chen, How-Ji
AU  - Chen HJ
AD  - Department of Civil Engineering, National Chung-Hsing University, No. 250, Kuo 
      Kuang Road, Taichung 402, Taiwan.
FAU - Peng, Ching-Fang
AU  - Peng CF
AD  - Department of Civil Engineering, National Chung-Hsing University, No. 250, Kuo 
      Kuang Road, Taichung 402, Taiwan.
FAU - Tang, Chao-Wei
AU  - Tang CW
AD  - Department of Civil Engineering & Geomatics, Cheng Shiu University, No. 840, 
      Chengching Rd., Niaosong District, Kaohsiung 83347, Taiwan.
AD  - Center for Environmental Toxin and Emerging-Contaminant Research, Cheng Shiu 
      University, No. 840, Chengching Rd., Niaosong District, Kaohsiung 83347, Taiwan.
AD  - Super Micro Mass Research & Technology Center, Cheng Shiu University, No. 840, 
      Chengching Rd., Niaosong District, Kaohsiung 83347, Taiwan.
FAU - Chen, Yi-Tien
AU  - Chen YT
AD  - Department of Civil Engineering, National Chung-Hsing University, No. 250, Kuo 
      Kuang Road, Taichung 402, Taiwan.
LA  - eng
PT  - Journal Article
DEP - 20191208
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC6947293
OTO - NOTNLM
OT  - Bacillus pasteurii bacteria
OT  - crack repair
OT  - self-healing concrete
COIS- The authors declare no conflict of interest.
EDAT- 2019/12/11 06:00
MHDA- 2019/12/11 06:01
PMCR- 2019/12/08
CRDT- 2019/12/11 06:00
PHST- 2019/11/08 00:00 [received]
PHST- 2019/11/29 00:00 [revised]
PHST- 2019/12/06 00:00 [accepted]
PHST- 2019/12/11 06:00 [entrez]
PHST- 2019/12/11 06:00 [pubmed]
PHST- 2019/12/11 06:01 [medline]
PHST- 2019/12/08 00:00 [pmc-release]
AID - ma12244099 [pii]
AID - materials-12-04099 [pii]
AID - 10.3390/ma12244099 [doi]
PST - epublish
SO  - Materials (Basel). 2019 Dec 8;12(24):4099. doi: 10.3390/ma12244099.