PMID- 36363345
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20221117
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 15
IP  - 21
DP  - 2022 Nov 3
TI  - Morphological Changes of Calcium Carbonate and Mechanical Properties of Samples 
      during Microbially Induced Carbonate Precipitation (MICP).
LID - 10.3390/ma15217754 [doi]
LID - 7754
AB  - Recently, microbially induced carbonate precipitation (MICP) has shown potent 
      potential in the field of civil engineering. The calcium carbonate crystals 
      produced by bacteria during the MICP process play a central role in sticking the 
      soil. However, the morphological changes of calcium carbonate crystals in this 
      process and the mechanical performance of soil in the corresponding stages have 
      not been clearly explored. In this paper, the alterations in the morphology of 
      calcium carbonate crystals were continuously observed via scanning electron 
      microscopy during the MICP process in one week, and the mechanical changes of the 
      samples were monitored every day, so as to reveal the relationship between the 
      morphology of calcium carbonate crystals and the mechanical performance of the 
      samples. The results show that the calcium carbonate crystals undergo a gradual 
      change from ellipsoid to rhombic at the 72nd hour. The mechanical properties of 
      both were greatly improved, among which the compressive strength was increased by 
      2.78 times compared with the previous time point, and the flexure strength was 
      increased by 2.57 times; this time point was also the time when calcite appears. 
      In addition, we found direct evidence on the first day that bacteria act as the 
      nucleation site of calcium carbonate formation. The above findings have certain 
      guiding significance for the in-depth understanding of the internal microscopic 
      changes of MICP and the influence of calcium carbonate morphology on sample 
      mechanics.
FAU - Gu, Zhaorui
AU  - Gu Z
AD  - Key Laboratory of Molecular Biophysics of the Ministry of Education, College of 
      Life Science and Technology, Huazhong University of Science and Technology, Wuhan 
      430074, China.
FAU - Chen, Qing
AU  - Chen Q
AD  - Key Laboratory of Molecular Biophysics of the Ministry of Education, College of 
      Life Science and Technology, Huazhong University of Science and Technology, Wuhan 
      430074, China.
FAU - Wang, Lishuang
AU  - Wang L
AD  - Key Laboratory of Molecular Biophysics of the Ministry of Education, College of 
      Life Science and Technology, Huazhong University of Science and Technology, Wuhan 
      430074, China.
FAU - Niu, Shuang
AU  - Niu S
AD  - Key Laboratory of Molecular Biophysics of the Ministry of Education, College of 
      Life Science and Technology, Huazhong University of Science and Technology, Wuhan 
      430074, China.
FAU - Zheng, Junjie
AU  - Zheng J
AD  - Institute of Geotechnical and Underground Engineering, Huazhong University of 
      Science and Technology, Wuhan 430074, China.
FAU - Yang, Min
AU  - Yang M
AD  - Key Laboratory of Molecular Biophysics of the Ministry of Education, College of 
      Life Science and Technology, Huazhong University of Science and Technology, Wuhan 
      430074, China.
FAU - Yan, Yunjun
AU  - Yan Y
AUID- ORCID: 0000-0001-6643-597X
AD  - Key Laboratory of Molecular Biophysics of the Ministry of Education, College of 
      Life Science and Technology, Huazhong University of Science and Technology, Wuhan 
      430074, China.
LA  - eng
GR  - 41972319/National Natural Science Foundation of China/
GR  - 2017KFTSZZ001/the Fundamental Research Funds for HUST/
PT  - Journal Article
DEP - 20221103
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC9655993
OTO - NOTNLM
OT  - MICP
OT  - calcium carbonate
OT  - crystal morphology
OT  - mechanical properties
OT  - nucleation sites
COIS- The authors declare no conflict of interest.
EDAT- 2022/11/12 06:00
MHDA- 2022/11/12 06:01
PMCR- 2022/11/03
CRDT- 2022/11/11 01:35
PHST- 2022/10/08 00:00 [received]
PHST- 2022/11/01 00:00 [revised]
PHST- 2022/11/02 00:00 [accepted]
PHST- 2022/11/11 01:35 [entrez]
PHST- 2022/11/12 06:00 [pubmed]
PHST- 2022/11/12 06:01 [medline]
PHST- 2022/11/03 00:00 [pmc-release]
AID - ma15217754 [pii]
AID - materials-15-07754 [pii]
AID - 10.3390/ma15217754 [doi]
PST - epublish
SO  - Materials (Basel). 2022 Nov 3;15(21):7754. doi: 10.3390/ma15217754.