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Precipitation of Calcite by Indigenous Microorganisms to Strengthen Liquefiable Soils

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Enrichments for indigenous microorganisms capable of hydrolyzing urea in the presence of CaCl2 were performed on potentially liquefiable saturated soils in both the laboratory and in situ. Following enrichment, treatment of soils with nutrients, CaCl2 and urea resulted in significant in situ precipitation of calcite, even at depth, by indigenous microorganisms. The biomineralized soils showed properties that indicate calcite precipitation increased their resistance to seismic-induced liquefaction.
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Keywords: bio-soil; bio-stimulation; biomineralization; calcite; liquefaction

Document Type: Research Article

Affiliations: 1: Environmental Biotechnology Institute, University of Idaho, Moscow, Idaho, USA 2: U.S. Nuclear Regulatory Commission, Washington, District of Columbia, USA 3: Department of Biological and Agricultural Engineering, University of Idaho, Moscow, Idaho, USA 4: Environmental Biotechnology Institute, University of Idaho, Moscow, Idaho, USA,Department of Microbiology, Molecular Biology and Biochemistry, University of Idaho, Moscow, Idaho, USA

Publication date: 01 May 2011

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