PMID- 36233871
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20221019
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 15
IP  - 19
DP  - 2022 Sep 21
TI  - Incorporation of Mixing Microbial Induced Calcite Precipitation (MICP) with 
      Pretreatment Procedure for Road Soil Subgrade Stabilization.
LID - 10.3390/ma15196529 [doi]
LID - 6529
AB  - Microbial induced carbonate precipitation (MICP) provides an alternative method 
      to stabilize the soil. To further improve the reinforcement effect, this study 
      aims to propose a strategy by incorporating the mixing MICP method with 
      pretreatment procedure. A series of laboratory tests were performed to 
      investigate the preparation parameters (including the moisture content and dry 
      density of the soil, the concentration of urea and CaCl(2) in cementation 
      solution), the engineering properties, the CaCO(3) distribution as well as the 
      mineralogical and micro structural characteristics of pretreatment-mixing MICP 
      reinforced soil (PMMRS). Based on the orthogonal experiment results, the optimum 
      preparation parameters for PMMRS were determined. The UCS of PMMRS was more 
      strongly dependent on the moisture content and concentration of CaCl(2) than the 
      concentration ratio of CaCl(2) to urea. Moreover, it was testified that 
      incorporation of pretreatment procedure improved the stabilization effect of 
      traditional mixing MICP method on the clayed sand (CLS). The UCS of PMMRS 
      specimen was increased by 198% and 78% for the pure CLS and the simple mixing 
      MICP reinforced soil, respectively. Furthermore, the CaCO(3) products generated 
      consisted of the aragonite, calcite and vaterite, which distributed unevenly 
      inside the specimen no matter the lateral or vertical direction. The reason for 
      the uneven distribution might be that oxygen content varied with the regions in 
      different directions, and hence affected the mineralization reaction. In 
      addition, the mineralization reaction would affect the pore structure of the 
      soil, which was highly related to the stabilization effect of MICP reinforced 
      soil.
FAU - Hu, Xiaodi
AU  - Hu X
AD  - School of Civil Engineering and Architecture, Wuhan Institute of Technology, 
      Wuhan 430205, China.
AD  - Hubei Provincial Engineering Research Center for Green Civil Engineering 
      Materials and Structures, Wuhan 430073, China.
FAU - Fu, Xiongzheng
AU  - Fu X
AUID- ORCID: 0000-0002-0978-0360
AD  - School of Civil Engineering and Architecture, Wuhan Institute of Technology, 
      Wuhan 430205, China.
FAU - Pan, Pan
AU  - Pan P
AD  - School of Civil Engineering and Architecture, Wuhan Institute of Technology, 
      Wuhan 430205, China.
AD  - Hubei Provincial Engineering Research Center for Green Civil Engineering 
      Materials and Structures, Wuhan 430073, China.
FAU - Lin, Lirong
AU  - Lin L
AD  - School of Civil Engineering and Architecture, Wuhan Institute of Technology, 
      Wuhan 430205, China.
AD  - Hubei Provincial Academy of Building Research and Design Co., Ltd., Wuhan 430071, 
      China.
FAU - Sun, Yihan
AU  - Sun Y
AD  - Zhejiang Academy of Transportation Sciences, Hangzhou 310023, China.
LA  - eng
GR  - No. 2019CFB330/the Nature Science Foundation of Hubei Province/
GR  - No. LGG21E080002/Zhejiang Provincial Natural Science Foundation/
GR  - No. 2022-11-1-2/Technology Project of Department of Transportation of Hubei 
      Province/
PT  - Journal Article
DEP - 20220921
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC9573274
OTO - NOTNLM
OT  - microbial induced calcite precipitation (MICP)
OT  - pretreatment-mixing MICP method
OT  - subgrade soil stabilization
COIS- The authors declare no conflict of interest.
EDAT- 2022/10/15 06:00
MHDA- 2022/10/15 06:01
PMCR- 2022/09/21
CRDT- 2022/10/14 02:18
PHST- 2022/07/29 00:00 [received]
PHST- 2022/09/13 00:00 [revised]
PHST- 2022/09/15 00:00 [accepted]
PHST- 2022/10/14 02:18 [entrez]
PHST- 2022/10/15 06:00 [pubmed]
PHST- 2022/10/15 06:01 [medline]
PHST- 2022/09/21 00:00 [pmc-release]
AID - ma15196529 [pii]
AID - materials-15-06529 [pii]
AID - 10.3390/ma15196529 [doi]
PST - epublish
SO  - Materials (Basel). 2022 Sep 21;15(19):6529. doi: 10.3390/ma15196529.