Sand and silty-sand soil stabilization using bacterial enzyme–induced calcite precipitation (BEICP)

This paper examines the bio-derived stabilization of sand-only or sand-plus-silt soils using an extracted bacterial enzyme application to achieve induced calcite precipitation (ICP). As compared to conventional microbial induced calcite precipitation (MICP) methods, which use intact bacterial cells,...

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Bibliographic Details
Published in:Canadian geotechnical journal 2019-06, Vol.56 (6), p.808-822
Main Authors: Hoang, Tung, Alleman, James, Cetin, Bora, Ikuma, Kaoru, Choi, Sun-Gyu
Format: Article
Language:English
Subjects:
Bacteria
bactéries
bio-stabilization
biostabilisation
Calcite
Calcite crystals
Carbonates
Catalysis
Catalysts
Chemical precipitation
Compression
Compressive strength
enzyme
Enzymes
Hydrolases
Microorganisms
Permeability
Precipitation
Ratios
résistance au cisaillement
Sand
shear strength
Silt
Soil
Soil microbiology
Soil microorganisms
Soil mixtures
Soil permeability
Soil properties
Soil stabilization
Soils
Stabilization
Stabilizing
Urease
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Summary:This paper examines the bio-derived stabilization of sand-only or sand-plus-silt soils using an extracted bacterial enzyme application to achieve induced calcite precipitation (ICP). As compared to conventional microbial induced calcite precipitation (MICP) methods, which use intact bacterial cells, this strategy that uses free urease catalysts to secure bacterial enzyme–induced calcite precipitation (BEICP) appears to offer an improved means of bio-stabilizing silty-sand soils as compared to that of MICP processing. Several benefits may possibly be achieved with this BEICP approach, including bio-safety, environmental, and geotechnical improvements. Notably, the BEICP bio-stabilization results presented in this paper demonstrate (i) higher rates of catalytic urease activity, (ii) a wider range of application with sand-plus-silt soil applications bearing low-plasticity properties, and (iii) the ability to retain higher levels of soil permeability after BEICP processing. Comparative BEICP versus MICP results for sand-only systems are presented, along with BEICP-based results for stabilized soil mixtures at 90:10 and 80:20 percentile sand:silt ratios. This BEICP method’s ability to obtain unconfined compressive strength results in excess of 1000 kPa with sand-plus-silt soil mixtures is particularly noteworthy.
ISSN:0008-3674
1208-6010
DOI:10.1139/cgj-2018-0191