Improvement of Coarse Sand Engineering Properties by Microbially Induced Calcite Precipitation

Aamir Mahawish, Abdelmalek Bouazza, Will P. Gates

Research output: Contribution to journalArticleResearchpeer-review

Abstract

This paper investigates the effectiveness of microbially induced calcite precipitation method in improving the strength and stiffness of coarse sands using treatments based on a four-phase percolation technique. An increase of biochemical treatment cycles was associated with increased deposition of calcium carbonate (CaCO3) and consequently an increase in compressive strength. Furthermore, the bio-cemented coarse sand retained reasonable porosity and permeability, which should allow dissipation of pore water pressure if required. The results also establish a correlation between the strength gained and stiffness of the bio-cemented coarse sand with the increase in the amount of deposited CaCO3, initial relative density and dry density. Scanning electron microscopy and electron dispersive spectroscopy analysis indicate that the inter-structure of the bio-cemented coarse sand tend to change in morphology based upon the number of biochemical treatments used.

Original languageEnglish
Pages (from-to)887-897
Number of pages11
JournalGeomicrobiology Journal
Volume35
Issue number10
DOIs
Publication statusPublished - 26 Nov 2018

Keywords

  • Bio-cementation
  • coarse sand
  • ground improvement
  • MICP

Cite this

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abstract = "This paper investigates the effectiveness of microbially induced calcite precipitation method in improving the strength and stiffness of coarse sands using treatments based on a four-phase percolation technique. An increase of biochemical treatment cycles was associated with increased deposition of calcium carbonate (CaCO3) and consequently an increase in compressive strength. Furthermore, the bio-cemented coarse sand retained reasonable porosity and permeability, which should allow dissipation of pore water pressure if required. The results also establish a correlation between the strength gained and stiffness of the bio-cemented coarse sand with the increase in the amount of deposited CaCO3, initial relative density and dry density. Scanning electron microscopy and electron dispersive spectroscopy analysis indicate that the inter-structure of the bio-cemented coarse sand tend to change in morphology based upon the number of biochemical treatments used.",
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Improvement of Coarse Sand Engineering Properties by Microbially Induced Calcite Precipitation. / Mahawish, Aamir; Bouazza, Abdelmalek; Gates, Will P.

In: Geomicrobiology Journal, Vol. 35, No. 10, 26.11.2018, p. 887-897.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Improvement of Coarse Sand Engineering Properties by Microbially Induced Calcite Precipitation

AU - Mahawish, Aamir

AU - Bouazza, Abdelmalek

AU - Gates, Will P.

PY - 2018/11/26

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AB - This paper investigates the effectiveness of microbially induced calcite precipitation method in improving the strength and stiffness of coarse sands using treatments based on a four-phase percolation technique. An increase of biochemical treatment cycles was associated with increased deposition of calcium carbonate (CaCO3) and consequently an increase in compressive strength. Furthermore, the bio-cemented coarse sand retained reasonable porosity and permeability, which should allow dissipation of pore water pressure if required. The results also establish a correlation between the strength gained and stiffness of the bio-cemented coarse sand with the increase in the amount of deposited CaCO3, initial relative density and dry density. Scanning electron microscopy and electron dispersive spectroscopy analysis indicate that the inter-structure of the bio-cemented coarse sand tend to change in morphology based upon the number of biochemical treatments used.

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KW - ground improvement

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