PMID- 33990644
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20210928
LR  - 20230202
IS  - 2045-2322 (Electronic)
IS  - 2045-2322 (Linking)
VI  - 11
IP  - 1
DP  - 2021 May 14
TI  - Micro-mechanical performance evaluation of expansive soil biotreated with 
      indigenous bacteria using MICP method.
PG  - 10324
LID - 10.1038/s41598-021-89687-2 [doi]
LID - 10324
AB  - This study explored the effect of indigenous bacteria present in the soil to 
      stabilized swelling behavior and improving the mechanical property of expansive 
      soil. The objective of the research is to investigate the effectiveness of the 
      biostimulation microbial induced calcite precipitation (MICP) for controlling the 
      swelling-shrinkage behavior and improving shear strength of expansive soil. An 
      attempt was made to develop an effective procedure to culture the indigenous 
      bacteria for treating clays with varying plasticity and improve their engineering 
      behavior. The detailed procedure has been investigated to effectively apply the 
      MICP technique in clay soil, considering its low permeable nature. The 
      applicability of biostimulation to clayey soils in minimizing their swelling 
      potential and improving the strength is assessed. Both macroscale and microscale 
      studies were conducted on untreated and biostimulated soils to observe changes in 
      plasticity, strength, swelling, mineralogical, chemical characteristics. The 
      present method has shown an effective alternative to improve the road pavement 
      subgrade without affecting the eco-system of natural soil. The method 
      investigated the effective way of providing the enrichment and cementation 
      solution in clayey soil, which is the major concern in current literature. The 
      study confirms that the calcite content has been increased with biostimulated 
      MICP treatment up to 205% in the treated specimens and which future increased the 
      unconfined compressive strength and split tensile strength. A reduction in the 
      swelling pressure and swell strain is also observed. The results show that a 
      cost-effect and eco-friendly method can be deployed for stabilizing the road 
      pavement subgrades. The statistical assessment using multivariate analysis and 
      hierarchical clustering dendrogram has been carried out to investigate the effect 
      of the MICP treatment protocol on different soil and engineering parameters.
FAU - Tiwari, Nitin
AU  - Tiwari N
AUID- ORCID: 0000-0002-4507-7832
AD  - Department of Civil Engineering, Indian Institute of Technology Indore, Indore, 
      India. nitintiwari077@gmail.com.
FAU - Satyam, Neelima
AU  - Satyam N
AUID- ORCID: 0000-0002-5434-0671
AD  - Department of Civil Engineering, Indian Institute of Technology Indore, Indore, 
      India.
FAU - Sharma, Meghna
AU  - Sharma M
AUID- ORCID: 0000-0002-0351-1637
AD  - Department of Civil Engineering, Indian Institute of Technology Indore, Indore, 
      India.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20210514
PL  - England
TA  - Sci Rep
JT  - Scientific reports
JID - 101563288
SB  - IM
PMC - PMC8121830
COIS- The authors declare no competing interests.
EDAT- 2021/05/16 06:00
MHDA- 2021/05/16 06:01
PMCR- 2021/05/14
CRDT- 2021/05/15 05:59
PHST- 2020/12/19 00:00 [received]
PHST- 2021/04/30 00:00 [accepted]
PHST- 2021/05/15 05:59 [entrez]
PHST- 2021/05/16 06:00 [pubmed]
PHST- 2021/05/16 06:01 [medline]
PHST- 2021/05/14 00:00 [pmc-release]
AID - 10.1038/s41598-021-89687-2 [pii]
AID - 89687 [pii]
AID - 10.1038/s41598-021-89687-2 [doi]
PST - epublish
SO  - Sci Rep. 2021 May 14;11(1):10324. doi: 10.1038/s41598-021-89687-2.