PMID- 33198453
OWN - NLM
STAT- MEDLINE
DCOM- 20210225
LR  - 20210225
IS  - 1944-8252 (Electronic)
IS  - 1944-8244 (Linking)
VI  - 12
IP  - 47
DP  - 2020 Nov 25
TI  - Effect and Mechanism of Encapsulation-Based Spores on Self-Healing Concrete at 
      Different Curing Ages.
PG  - 52415-52432
LID - 10.1021/acsami.0c16343 [doi]
AB  - It has become an intelligent and environmental protection method to repair 
      concrete cracks based on microbial-induced calcium carbonate precipitation 
      (MICP). However, due to the high-alkali environment in concrete, even the 
      microbial spores with strong alkali resistance find it difficult to survive for a 
      long time, which affects the long-term self-healing effect of concrete cracks. In 
      this paper, low-alkali sulfo-aluminate cement (SC) was used as a carrier to 
      encapsulate spores, and the effects of the spore group and microbial group on the 
      basic performances of concrete were studied. Then, the area repair ratio, water 
      permeability, the repair ratio of anti-chloride ion penetration, and ultrasonic 
      velocity were used to evaluate the self-healing efficiency of cracks, and the 
      self-healing effects of two kinds of microbial self-healing agents on concrete 
      cracks with different curing ages were further studied. Moreover, the growth, 
      enzyme activity, and microbial morphologies of spores with and without 
      encapsulation immersed in the simulated pore solution of cement-based materials 
      at different times were studied to discuss the protective effect of the carrier 
      on spores. Compared with the reference group, the results showed that the 
      addition of two microbial self-healing agents would slightly affect the basic 
      performances of concrete, but both were within the control range of concrete 
      materials. For the early-age cracks, the two kinds of microbial self-healing 
      agents could achieve a good self-healing effect, but for the later-age cracks, 
      the concrete cracks of the microbial group could still be repaired well, while 
      the self-healing effect of the spore group was greatly reduced. Moreover, the 
      white precipitates generated at the crack mouth were all calcite CaCO(3). In 
      addition, the self-healing mechanism of different microbial self-healing agents 
      on concrete cracks was discussed carefully. This study provides a new idea and 
      method for the engineering application of microbial self-healing concrete.
FAU - Zheng, Tianwen
AU  - Zheng T
AD  - School of Materials Science and Engineering, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
AD  - Research Center of Green Building & Construction Materials, Southeast University, 
      Nanjing, Jiangsu 211189, P. R. China.
AD  - Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
FAU - Su, Yilin
AU  - Su Y
AD  - School of Materials Science and Engineering, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
AD  - Research Center of Green Building & Construction Materials, Southeast University, 
      Nanjing, Jiangsu 211189, P. R. China.
AD  - Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
FAU - Zhang, Xuan
AU  - Zhang X
AD  - School of Materials Science and Engineering, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
AD  - Research Center of Green Building & Construction Materials, Southeast University, 
      Nanjing, Jiangsu 211189, P. R. China.
AD  - Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
FAU - Zhou, Hengyi
AU  - Zhou H
AD  - School of Materials Science and Engineering, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
AD  - Research Center of Green Building & Construction Materials, Southeast University, 
      Nanjing, Jiangsu 211189, P. R. China.
AD  - Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
FAU - Qian, Chunxiang
AU  - Qian C
AUID- ORCID: 0000-0002-2515-2233
AD  - School of Materials Science and Engineering, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
AD  - Research Center of Green Building & Construction Materials, Southeast University, 
      Nanjing, Jiangsu 211189, P. R. China.
AD  - Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, 
      Jiangsu 211189, P. R. China.
LA  - eng
PT  - Journal Article
DEP - 20201116
PL  - United States
TA  - ACS Appl Mater Interfaces
JT  - ACS applied materials & interfaces
JID - 101504991
RN  - 0 (Chlorides)
RN  - 059QF0KO0R (Water)
RN  - H0G9379FGK (Calcium Carbonate)
SB  - IM
MH  - Bacillus/*metabolism
MH  - Calcium Carbonate/chemistry/metabolism
MH  - Chlorides/chemistry/metabolism
MH  - Permeability
MH  - Spores, Bacterial/*metabolism
MH  - Time Factors
MH  - Water/chemistry
OTO - NOTNLM
OT  - carrier
OT  - curing ages
OT  - protective
OT  - self-healing concrete
OT  - self-healing efficiency
EDAT- 2020/11/18 06:00
MHDA- 2021/02/26 06:00
CRDT- 2020/11/17 05:40
PHST- 2020/11/18 06:00 [pubmed]
PHST- 2021/02/26 06:00 [medline]
PHST- 2020/11/17 05:40 [entrez]
AID - 10.1021/acsami.0c16343 [doi]
PST - ppublish
SO  - ACS Appl Mater Interfaces. 2020 Nov 25;12(47):52415-52432. doi: 
      10.1021/acsami.0c16343. Epub 2020 Nov 16.