Improving the Strength of Sandy Soils via Ureolytic CaCO <sub>3</sub> Solidification by <i>Sporosarcina ureae</i>
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Geotechnical microbiology on microbially induced carbonate precipitation to strengthen sandy soils; the object is a ground reinforcement process.
This materials-engineering study tests microbial soil strengthening, not research practice.
Geotechnical/microbial soil solidification via MICP; environmental engineering domain.
Abstract
Abstract. Microbial induced carbonate precipitation (MICP) is a biogeochemical process that can be applied to strengthen materials. The hydrolysis of urea by microbial catalysis to form carbonate is a commonly studied example of MICP. In this study, Sporosarcina ureae, a ureolytic organism, was compared to other ureolytic and non-ureolytic organisms of Bacillus and Sporosarcina in the assessment of its ability to produce carbonates by ureolytic MICP for ground reinforcement. It was found that S. ureae grew optimally in alkaline (pH ~ 9.0) conditions which favoured MICP and could degrade urea (30.28 U/mL) at levels similar to S. pasteurii (32.76 U/mL), the model ureolytic MICP organism. When cells of S. ureae were concentrated (OD600 ~ 15–20) and mixed with cementation medium containing 0.5 M calcium chloride (CaCl2) and urea into a model sand, repeated treatments (3 × 24 h) were able to improve the confined direct shear strength of samples from 15.77 kPa to as much as 135.8 kPa. This was more than any other organism observed in the study. Imaging of the reinforced samples with scanning electron microscopy and energy dispersive spectroscopy confirmed the successful precipitation of calcium carbonate (CaCO3), organized as calcite, across sand particles by S. ureae. Treated samples were also tested experimentally according to model North American climatic conditions to understand the environmental durability of MICP. No significant (p
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The record
- Venue
- Topic
- Microbial Applications in Construction Materials
- Field
- Environmental Science
- Canadian institutions
- University of Ottawa
- Funders
- —
- Keywords
- Calcium carbonateChemistryUreaCalciteEnvironmental chemistryCarbonateHydrolysisPrecipitationNuclear chemistryMineralogyBiochemistryOrganic chemistry
- Has abstract in OpenAlex
- yes