Large-Scale Comparison of Bioaugmentation and Biostimulation Approaches for Biocementation of Sands

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Abstract
Microbially induced calcite precipitation (MICP) is a promising biocementation process that can improve the geotechnical properties of granular soils through the precipitation of calcite. In this study, a large-scale biocementation experiment was completed to evaluate differences in improvement obtained using a bioaugmentation approach with S. pasteurii and a biostimulation approach, which stimulated native ureolytic microorganisms to complete the process. Two identical 1.7-m-diameter soil tank specimens containing a 0.3-m-thick layer of sand were treated using three wells at a well-to-well spacing of 1.2 m. Treatments were applied daily over 12 days and were designed to evaluate differences between tanks by creating a nonuniform spatial distribution of improvement. During treatment, shear wave velocity and biogeochemical changes were monitored spatially and temporally. Post-treatment, cone penetration tests were completed to assess improvement, and samples were obtained for calcite content measur...

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