PMID- 37115250
OWN - NLM
STAT- MEDLINE
DCOM- 20230515
LR  - 20230515
IS  - 1432-0614 (Electronic)
IS  - 0175-7598 (Linking)
VI  - 107
IP  - 11
DP  - 2023 Jun
TI  - Optimization of deposition process for a productive and cohesive bio-CaCO(3) to 
      repair concrete existing cracks.
PG  - 3479-3494
LID - 10.1007/s00253-023-12531-2 [doi]
AB  - Microbial-induced carbonate precipitation (MICP) is being investigated to repair 
      concrete cracks because of its good durability and compatibility with 
      cementitious matrix. However, during the in-situ application, the repairing often 
      lasts weeks, even months. And the strength regain is quite low. The repairing 
      time is largely determined by the CaCO(3) yield, and the strength regain after 
      the repair is closely related to the cohesion and bonding strength of CaCO(3) 
      itself. Thus, the purpose of this paper is to obtain an efficient precipitation 
      of bio-CaCO(3) with both high yield and good cohesion to improve the in-situ 
      repairing efficiency. Firstly, the most influential factors on urease activity 
      were screened and the precipitation kinetics were detailly investigated. The 
      results show that the CaCO(3) with the largest yield and cohesion was obtained 
      when the bacterial concentration was 10(7) cells/mL and the concentration of urea 
      and calcium was both 0.5 M at 20  degrees C. This weight loss of bio-CaCO(3) was 9.24% 
      under ultrasonic attack. Secondly, two models were established to quantify or 
      semi-quantify the relationship between the most influential factors and the yield 
      and cohesion of precipitates, respectively. The results showed the order of 
      contribution for bio-CaCO(3) precipitation was calcium ions concentration > 
      bacterial concentration > urea concentration > temperature > initial pH. 
      According to these models, the required yield and cohesion of CaCO(3) by 
      engineering could be obtained by adjusting affecting factors. Models were 
      proposed for guiding the application of MICP in practical engineering. KEY 
      POINTS: * Screened the most affecting factors on urease activity and investigated 
      the precipitation kinetics. * Obtained optimal conditions of bio-CaCO. * 
      Established two models in order to give some guidance for practical civil 
      engineering.
CI  - (c) 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, 
      part of Springer Nature.
FAU - Gao, Ruixiao
AU  - Gao R
AD  - Department of Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
FAU - Ma, Jinhu
AU  - Ma J
AD  - Department of Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
FAU - Liu, Gang
AU  - Liu G
AD  - Department of Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
FAU - Chen, Huayu
AU  - Chen H
AD  - Department of Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China.
FAU - Wen, Jianfeng
AU  - Wen J
AD  - Anhui China Railway Engineering Materials Technology Co. Ltd, Hefei, 230041, 
      China.
FAU - Wang, Jianyun
AU  - Wang J
AUID- ORCID: 0000-0001-9718-8633
AD  - Department of Civil Engineering, Xi'an Jiaotong University, Xi'an, 710049, China. 
      jianyun.wang@xjtu.edu.cn.
LA  - eng
PT  - Journal Article
DEP - 20230428
PL  - Germany
TA  - Appl Microbiol Biotechnol
JT  - Applied microbiology and biotechnology
JID - 8406612
RN  - SY7Q814VUP (Calcium)
RN  - EC 3.5.1.5 (Urease)
RN  - H0G9379FGK (Calcium Carbonate)
RN  - 8W8T17847W (Urea)
SB  - IM
MH  - *Calcium
MH  - *Urease
MH  - Calcium Carbonate
MH  - Chemical Precipitation
MH  - Bacteria
MH  - Urea
OTO - NOTNLM
OT  - Bio-CaCO3,
OT  - Cohesion,
OT  - Crack,
OT  - Existing concrete
OT  - Model,
OT  - Yield,
EDAT- 2023/04/28 12:43
MHDA- 2023/05/15 06:42
CRDT- 2023/04/28 11:05
PHST- 2022/12/09 00:00 [received]
PHST- 2023/04/15 00:00 [accepted]
PHST- 2023/04/12 00:00 [revised]
PHST- 2023/05/15 06:42 [medline]
PHST- 2023/04/28 12:43 [pubmed]
PHST- 2023/04/28 11:05 [entrez]
AID - 10.1007/s00253-023-12531-2 [pii]
AID - 10.1007/s00253-023-12531-2 [doi]
PST - ppublish
SO  - Appl Microbiol Biotechnol. 2023 Jun;107(11):3479-3494. doi: 
      10.1007/s00253-023-12531-2. Epub 2023 Apr 28.