PMID- 35629442
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20220716
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 15
IP  - 10
DP  - 2022 May 10
TI  - The Effect of Clay on the Shear Strength of Microbially Cured Sand Particles.
LID - 10.3390/ma15103414 [doi]
LID - 3414
AB  - Microbial solidification of sand has obvious effects: energy-saving and 
      environmental protection. It is a green and sustainable soil consolidation 
      technology with low energy consumption, which meets the needs of high-quality 
      development of modern economy and society. However, when clay is doped in sand, 
      clay has an uncertain influence on the effectiveness of the microbial 
      solidification of sand. Therefore, triaxial consolidation undrained tests before 
      and after microbial solidification of sands with different clay content are 
      carried out in this paper. The effects of clay content on the solidification 
      effect of sands are compared and analyzed. The variation laws of shear strength, 
      unconfined compressive strength, internal friction angle and the cohesion of 
      sands with different clay content before and after microbial solidification are 
      discussed. The failure modes of sand samples were studied and the influence 
      mechanism of clay on the microbial solidification of sand was revealed from a 
      micro perspective. The test results show that the failure strain and unconfined 
      compressive strength of microbial-induced calcium carbonate precipitation (MICP) 
      treated samples increase first and then decrease with the increase in the clay 
      content. The unconfined compressive strength is the highest when the clay content 
      is 9%, and the samples with low clay content (3~9%) can still retain good 
      integrity after being destroyed. As the content of clay in the sand-clay mixture 
      increases, the internal friction angle of the sample decreases and the cohesion 
      increases. After MICP treatment, the internal friction angle and cohesion of the 
      sand increase first and then decrease with the increase in clay content. There 
      are three main contact modes between sand-clay-CaCO(3). When clay content is low, 
      clay plays a filling role. The contact mode between sand-clay and CaCO(3) is 
      mainly between sand particles and calcium carbonate and between clay particles 
      and calcium carbonate. When clay content is high, the contact mode between 
      particles is mainly between clay particles and calcium carbonate. Higher clay 
      content wraps sand particles, prevents contact between calcium carbonate and sand 
      particles and reduces the strength of sand.
FAU - Feng, Deluan
AU  - Feng D
AD  - School of Civil and Transportation Engineering, Guangdong University of 
      Technology, Guangzhou 510006, China.
FAU - Gao, Haiqin
AU  - Gao H
AD  - School of Civil and Transportation Engineering, Guangdong University of 
      Technology, Guangzhou 510006, China.
FAU - Li, Zhanlin
AU  - Li Z
AD  - School of Civil and Transportation Engineering, Guangdong University of 
      Technology, Guangzhou 510006, China.
FAU - Liang, Shihua
AU  - Liang S
AD  - School of Civil and Transportation Engineering, Guangdong University of 
      Technology, Guangzhou 510006, China.
LA  - eng
GR  - 202002030194/the Science and Technology Program of Guangzhou, China/
PT  - Journal Article
DEP - 20220510
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC9142917
OTO - NOTNLM
OT  - microbial curing
OT  - strength characteristics
OT  - triaxial consolidation without drainage test
OT  - viscous particle content
COIS- The authors declare no conflict of interest.
EDAT- 2022/05/29 06:00
MHDA- 2022/05/29 06:01
PMCR- 2022/05/10
CRDT- 2022/05/28 01:28
PHST- 2022/03/25 00:00 [received]
PHST- 2022/04/17 00:00 [revised]
PHST- 2022/05/03 00:00 [accepted]
PHST- 2022/05/28 01:28 [entrez]
PHST- 2022/05/29 06:00 [pubmed]
PHST- 2022/05/29 06:01 [medline]
PHST- 2022/05/10 00:00 [pmc-release]
AID - ma15103414 [pii]
AID - materials-15-03414 [pii]
AID - 10.3390/ma15103414 [doi]
PST - epublish
SO  - Materials (Basel). 2022 May 10;15(10):3414. doi: 10.3390/ma15103414.