PMID- 34640027
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20211016
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 14
IP  - 19
DP  - 2021 Sep 28
TI  - Mechanism of Sand Cementation with an Efficient Method of Microbial-Induced 
      Calcite Precipitation.
LID - 10.3390/ma14195631 [doi]
LID - 5631
AB  - This paper presents an efficient method of microbial-induced calcite 
      precipitation (MICP) for cementation of sand particles. First, the influence of 
      initial pH value of the culture medium on the growth of bacteria was discussed. 
      Then, the compressive strength and calcium carbonate content of cemented sand 
      columns with different sand particle sizes were measured to indicate the 
      cementation effectiveness. The microstructure of cemented sand columns as well as 
      the mineral composition and distribution of calcium carbonate were characterised 
      by means of scanning electron microscopy-energy dispersive spectrometer (SEM-EDS) 
      and X-ray diffraction (XRD). The results showed that the urease-producing 
      bacteria S. pasteurii can be cultured at the initial pH values of 7-10, while a 
      higher pH (e.g., 11) would hinder its growth and decrease its urease activity. 
      The injection method of MICP with high standing time can cement sand columns 
      effectively. Small average sand particle size of sand columns and high injection 
      cycles can facilitate the gain of compressive strength, while calcium carbonate 
      content of sand column higher than 8% can promote the increase of compressive 
      strength. XRD results indicate that the fine grains generated on the surface of 
      sand particles are calcite. The distribution of calcite on sand particles' 
      surface is broad and uniform. First, calcite was precipitated on the surface of 
      sand particles, and then a precipitation layer was formed, which would connect 
      sand particles through its high enough thickness and contribute to the 
      development of compressive strength of the whole sand column.
FAU - Wang, Lu
AU  - Wang L
AD  - State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan 
      University, Wuhan 430072, China.
FAU - Liu, Shuhua
AU  - Liu S
AUID- ORCID: 0000-0002-8333-1045
AD  - State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan 
      University, Wuhan 430072, China.
LA  - eng
GR  - 2020YFC1806401/National Key R&D Program of China/
GR  - 2020010601012200/Application Foundation Frontier Project of Wuhan City/
GR  - 2019SGG01/Visiting Researcher Fund Program of State Key Laboratory of Water 
      Resources and Hydropower Engineering Science/
PT  - Journal Article
DEP - 20210928
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC8510110
OTO - NOTNLM
OT  - calcium carbonate content
OT  - cemented sand
OT  - compressive strength
OT  - microbial-induced calcite precipitation
OT  - microstructure
COIS- The authors declare no conflict of interest.
EDAT- 2021/10/14 06:00
MHDA- 2021/10/14 06:01
PMCR- 2021/09/28
CRDT- 2021/10/13 01:09
PHST- 2021/08/21 00:00 [received]
PHST- 2021/09/20 00:00 [revised]
PHST- 2021/09/25 00:00 [accepted]
PHST- 2021/10/13 01:09 [entrez]
PHST- 2021/10/14 06:00 [pubmed]
PHST- 2021/10/14 06:01 [medline]
PHST- 2021/09/28 00:00 [pmc-release]
AID - ma14195631 [pii]
AID - materials-14-05631 [pii]
AID - 10.3390/ma14195631 [doi]
PST - epublish
SO  - Materials (Basel). 2021 Sep 28;14(19):5631. doi: 10.3390/ma14195631.