PMID- 34576362
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20211001
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 14
IP  - 18
DP  - 2021 Sep 7
TI  - Improvement and Soil Consistency of Sand-Clay Mixtures Treated with 
      Enzymatic-Induced Carbonate Precipitation.
LID - 10.3390/ma14185140 [doi]
LID - 5140
AB  - Recently, microbially induced carbonate precipitation (MICP) has been studied as 
      an alternative for the improvement of sand-clay mixtures. However, the cementing 
      uniformity of MICP-treated sand-clay mixtures cannot be guaranteed. In this 
      present study, enzymatic-induced carbonate precipitation (EICP) was used to deal 
      with it. The ions used in kaolin clay was predicted to affect the production rate 
      for calcium carbonate (CaCO(3)), which was studied using the calcification test. 
      The solidification test was conducted using two different methods (the premixing 
      method and the diffusion method). The permeability, unconfined compressive 
      strength and the content of CaCO(3) of treated samples were obtained to evaluate 
      the solidification effect of the EICP method. Moreover, in EICP treatment, the 
      particle aggregation decreased the liquid limit, but the addition of solution 
      increased it. Therefore, there were contrary effects to the soil consistency. In 
      this study, the two types of liquid limits of treated samples were measured with 
      deionized water and 2M-NaCl brine, respectively. The results show that the 
      Al(2)O(3), NaCl and MgCl(2) in the kaolin clay had a slight impact on the 
      production rate for CaCO(3), while FeCl(3) significantly inhibited it. The EICP 
      method can improve sand-clay mixtures and decrease their permeability. Different 
      from MICP, the EICP method can guarantee the uniformity of treated samples. 
      Moreover, the liquid limit of the sample treated with the premixing method 
      decreased, while that of the sample treated with the diffusion method increased 
      firstly and then decreased with the increasing treatment cycles. Different from 
      the deionized water, the pore-fluid chemistry had a larger effect on the liquid 
      limit with 2M-NaCl brine.
FAU - Mo, Yixin
AU  - Mo Y
AUID- ORCID: 0000-0002-0199-089X
AD  - College of Defence Engineering, Army Engineering University of PLA, Nanjing 
      210007, China.
FAU - Yue, Songlin
AU  - Yue S
AD  - College of Defence Engineering, Army Engineering University of PLA, Nanjing 
      210007, China.
FAU - Zhou, Qizhen
AU  - Zhou Q
AUID- ORCID: 0000-0001-5509-0902
AD  - College of Defence Engineering, Army Engineering University of PLA, Nanjing 
      210007, China.
FAU - Liu, Xiao
AU  - Liu X
AD  - College of Defence Engineering, Army Engineering University of PLA, Nanjing 
      210007, China.
LA  - eng
GR  - 51808553/National Natural Science Foundation of China/
PT  - Journal Article
DEP - 20210907
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC8470128
OTO - NOTNLM
OT  - EICP
OT  - UCS
OT  - liquid limit
OT  - permeability
OT  - sand-clay mixtures
COIS- The authors declare that they have no conflict of interest.
EDAT- 2021/09/29 06:00
MHDA- 2021/09/29 06:01
PMCR- 2021/09/07
CRDT- 2021/09/28 01:19
PHST- 2021/07/20 00:00 [received]
PHST- 2021/08/31 00:00 [revised]
PHST- 2021/09/01 00:00 [accepted]
PHST- 2021/09/28 01:19 [entrez]
PHST- 2021/09/29 06:00 [pubmed]
PHST- 2021/09/29 06:01 [medline]
PHST- 2021/09/07 00:00 [pmc-release]
AID - ma14185140 [pii]
AID - materials-14-05140 [pii]
AID - 10.3390/ma14185140 [doi]
PST - epublish
SO  - Materials (Basel). 2021 Sep 7;14(18):5140. doi: 10.3390/ma14185140.