PMID- 37269526
OWN - NLM
STAT- MEDLINE
DCOM- 20230703
LR  - 20230703
IS  - 1614-7499 (Electronic)
IS  - 0944-1344 (Linking)
VI  - 30
IP  - 32
DP  - 2023 Jul
TI  - Multi-scale analysis of the mechanism of microbially induced calcium carbonate 
      precipitation consolidation loess.
PG  - 78469-78481
LID - 10.1007/s11356-023-27862-w [doi]
AB  - Microbial-induced calcium carbonate precipitation (MICP) treatment of 
      consolidated loess has the advantages of high efficiency and environmental 
      protection. In this study, changes in the microscopic pore structure of loess 
      before and after MICP treatment were compared and quantified, combined with test 
      results at different scales, to better understand the mechanisms of 
      MICP-consolidated loess. The unconfined compressive strength (UCS) of 
      MICP-consolidated loess is significantly increased, and the stress-strain curve 
      indicates improved strength and stability of the loess. X-ray diffraction (XRD) 
      test results show that the signal strength of calcium carbonate crystals is 
      significantly enhanced after loess consolidation. The microstructure of the loess 
      was determined by scanning electron microscopy (SEM). The loess SEM 
      microstructure images are quantitatively analyzed using comprehensive image 
      processing methods (including gamma adjustment, grayscale threshold selection, 
      median processing). The changes in microscopic pore area and average pore sizes 
      (Feret diameter) of the loess before and after consolidation are described. More 
      than 95% of the pores consist of pores with a pore area of less than 100 mum(2) 
      and an average pore size of less than 20 mum. The total percentage of pore numbers 
      with pore areas of 100-200 and 200-1000 mum(2) decreased by 1.15% after MICP 
      consolidation, while those with 0-1 and 1-100 mum(2) increased. The percentage of 
      pore numbers with an average pore size greater than 20 mum decreased by 0.93%, 
      while the 0-1, 1-10, and 10-20 mum increased. Particle size distributions revealed 
      a significant increase in particle size after MICP consolidation, with an 
      increase of 89 mum in D(50).
CI  - (c) 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, 
      part of Springer Nature.
FAU - Zhou, Xingyu
AU  - Zhou X
AD  - School of Engineering and Technology, China University of Geosciences, Beijing, 
      100083, People's Republic of China.
FAU - Wang, Guihe
AU  - Wang G
AUID- ORCID: 0000-0003-1590-8268
AD  - School of Engineering and Technology, China University of Geosciences, Beijing, 
      100083, People's Republic of China. wanggh@cugb.edu.cn.
FAU - Zhang, Haonan
AU  - Zhang H
AD  - School of Engineering and Technology, China University of Geosciences, Beijing, 
      100083, People's Republic of China.
FAU - Jia, Cangqin
AU  - Jia C
AD  - School of Engineering and Technology, China University of Geosciences, Beijing, 
      100083, People's Republic of China.
AD  - Key Laboratory of Deep Geodrilling Technology, Ministry of Land and Resources, 
      Beijing, 100083, People's Republic of China.
FAU - Tang, Guowang
AU  - Tang G
AD  - School of Engineering and Technology, China University of Geosciences, Beijing, 
      100083, People's Republic of China.
LA  - eng
GR  - No. ZD2021YC059/China University of Geosciences, Beijing/
PT  - Journal Article
DEP - 20230603
PL  - Germany
TA  - Environ Sci Pollut Res Int
JT  - Environmental science and pollution research international
JID - 9441769
RN  - H0G9379FGK (Calcium Carbonate)
SB  - IM
MH  - *Calcium Carbonate/chemistry
MH  - Chemical Precipitation
MH  - Microscopy, Electron, Scanning
MH  - X-Ray Diffraction
OTO - NOTNLM
OT  - MICP-consolidated loess
OT  - Macro mechanical properties
OT  - Microscopic pore structures
OT  - SEM image processing
EDAT- 2023/06/03 21:08
MHDA- 2023/07/03 06:41
CRDT- 2023/06/03 15:02
PHST- 2023/02/09 00:00 [received]
PHST- 2023/05/19 00:00 [accepted]
PHST- 2023/07/03 06:41 [medline]
PHST- 2023/06/03 21:08 [pubmed]
PHST- 2023/06/03 15:02 [entrez]
AID - 10.1007/s11356-023-27862-w [pii]
AID - 10.1007/s11356-023-27862-w [doi]
PST - ppublish
SO  - Environ Sci Pollut Res Int. 2023 Jul;30(32):78469-78481. doi: 
      10.1007/s11356-023-27862-w. Epub 2023 Jun 3.