Michael G. Gomez

Michael G. Gomez
University of Washington Seattle | UW · Department of Civil and Environmental Engineering

Doctor of Philosophy

About

33
Publications
9,154
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794
Citations
Introduction
Skills and Expertise

Publications

Publications (33)
Conference Paper
Microbially induced calcite precipitation (MICP) is one of the most promising emerging environmentally conscious soil improvement techniques. The bio-cementation process offers an alternative to traditional mechanical, Portland cement, and silicate based ground improvement methods, by utilizing microbial activity to induce calcite precipitation on...
Article
Microbially induced calcite precipitation (MICP) is a biomediated cementation process that uses natural microbial enzymatic activity to improve the geotechnical properties of granular soils. In this study, two sets of experiments are completed using soil samples obtained from different depths to evaluate the feasibility of stimulating native ureoly...
Article
Full-text available
Microbially Induced Calcite Precipitation (MICP), or bio-cementation, is a promising bio-mediated technology that can improve the engineering properties of soils through the precipitation of calcium carbonate. Despite significant advances in the technology, concerns regarding the fate of produced NH4⁺ by-products have remained largely unaddressed....
Article
Microbially induced calcite precipitation (MICP) is an environmentally conscious ground-improvement method that can enhance the engineering properties of granular soils through the precipitation of calcium carbonate (CaCO3) on soil particle surfaces and contacts. Although numerous studies have shown the ability of biocementation to improve the liqu...
Conference Paper
Microbially induced calcite precipitation (MICP), or bio-cementation, is a bio-mediated, environmentally-conscious soil improvement technology that can improve the engineering properties of granular soils through the precipitation of calcium carbonate (CaCO3) on soil particle surfaces and contacts. While past studies have shown the potential of bio...
Article
Microbially induced calcite precipitation (MICP) is a ground improvement technique that uses ureolytic bacteria to biocement soils by precipitating calcium carbonate on soil contacts and surfaces. In this study, five 3.7-m long horizontal columns, each containing 0.15 m 3 of natural sand, were treated to address current knowledge gaps regarding the...
Conference Paper
Microbially induced calcite precipitation (MICP), or bio-cementation, is a bio-mediated, environmentally-conscious soil improvement technology that can improve the engineering properties of granular soils through the precipitation of calcium carbonate (CaCO3) on soil particle surfaces and contacts. While past studies have shown the potential of bio...
Conference Paper
Numerous laboratory studies in the past decade have demonstrated the ability of microbially induced calcite precipitation (MICP), a bio-mediated soil improvement method, to favorably transform a soil’s engineering properties including increased shear strength and stiffness with reductions in hydraulic conductivity and porosity. Despite significant...
Conference Paper
Microbially induced calcite precipitation (MICP) is a bio-mediated soil improvement technique that uses ureolytic bacteria to enable calcium carbonate precipitation. A meter-scale study was performed to investigate knowledge gaps critical for implementation at field-scale, including controlling spatial uniformity, managing ammonium by-products, and...
Article
Full-text available
Energy piles and ground source heat pump systems have been shown to provide sustainable alternatives for temperature regulation in buildings and other applications such as road de-icing. However, their efficiency can be undermined in partially-saturated and dry sandy soils due to the relatively low thermal conductivity (kt) of these materials. Micr...
Article
A set of saturated Ottawa sand models was treated with microbially induced calcite precipitation (MICP) and subjected to repeated shaking events using the 1-m radius centrifuge at the UC Davis Center for Geotechnical Modeling. Centrifuge models were constructed to initial relative densities (DR0) of approximately 38% and treated to light, moderate,...
Article
Full-text available
Microbially Induced Calcite Precipitation (MICP) is a bio-mediated cementation process that can improve the engineering properties of granular soils through the precipitation of calcite. The process is made possible by soil microorganisms containing urease enzymes, which hydrolyze urea and enable carbonate ions to become available for precipitation...
Conference Paper
Microbially-induced calcite precipitation (MICP) has been increasingly investigated as a novel ground improvement technique for the mitigation of earthquake-induced soil liquefaction. Experimental results including those from triaxial, direct simple shear, and small centrifuge tests have demonstrated the ability of MICP to increase the resistance o...
Conference Paper
Microbially induced calcite precipitation (MICP), or bio-cementation, has advanced rapidly in the past decade as a promising environmentally-conscious ground improvement alternative. In the ureolytic bio-cementation process, microorganisms containing urease enzymes are used to mediate the degradation of urea, thereby producing total ammonium, disso...
Article
Full-text available
The efficiency of energy piles and ground source heat pumps depends on the thermal conductivity of surrounding soils. This paper presents results obtained from a series of soil column experiments that examined the effect of microbially induced calcite precipitation (MICP) on soil thermal conductivity. Both MICP treatments and column drying tests we...
Conference Paper
A set of centrifuge model tests were conducted to evaluate the mitigation of earthquake-induced liquefaction of loose Ottawa sand treated with microbially induced calcite precipitation (MICP). The bio-mediated MICP process can facilitate the formation of cemented bonds at particle-particle contacts, which can induce large changes in soil engineerin...
Article
Microbially Induced Calcite Precipitation (MICP) is a bio-mediated soil cementation process that offers an environmentally conscious alternative to conventional geotechnical soil improvement technologies. This study provides the first comparison of ureolytic bacteria isolated from sand cemented in parallel, meter-scale, MICP experiments using eithe...
Article
Microbially Induced Calcite Precipitation (MICP) is a potentially environmentally conscious ground improvement method that can improve the engineering properties of granular soils through the precipitation of calcite. In this study, an experiment involving two 1.7 m diameter tank specimens was completed to investigate the effect of bio-cementation...
Article
Design of in situ microbially-induced calcite precipitation (MICP) strategies relies on a predictive capability. To date much of the mathematical modeling of MICP has focused on small-scale experiments and/or one-dimensional flow in porous media, and successful parameterizations of models in these settings may not pertain to larger scales or to non...
Conference Paper
Microbially induced calcite precipitation (MICP) is an environmentally conscious soil improvement technique that can improve the geotechnical properties of granular soils through the precipitation of calcite on soil particle surfaces and at particle contacts. In this study, synthesis of results from 47 soil column experiments involving 14 different...
Conference Paper
Microbially induced calcite precipitation is bio-mediated calcite precipitation process that can improve the geotechnical properties of granular soils. Bio-cementation offers an environmentally conscious alternative to more traditional ground improvement methods by utilizing natural microbial activity to induce calcite precipitation on soil particl...
Article
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. past...
Conference Paper
Full-text available
A new NSF-funded Engineering Research Center, the Center for Bio-mediated and Bio-inspired Geotechnics, is taking off, as is this new field of biogeotechnics! Arizona State University, is the lead with Edward Kavazanjian, Principal Investigator, and Claudia Zapata as Deputy Director, along with our partners, Georgia Tech, New Mexico State and Unive...
Presentation
Abstract for conference based on a project in which a reactive transport model simulation has been developed for a large-scale experiment involving MICP in context of geotechnical manipulation of soil strength.
Conference Paper
Microbially induced calcite precipitation (MICP) has advanced rapidly in the past decade; however, its implementation as a prevalent ground improvement technique has been partially limited by the need for cultivation and injection of specific bacterial strains. The future of this technology as a cost-competitive and environmentally conscious altern...
Conference Paper
Full-text available
The long-standing assumption in the geotechnical community that geotechnical systems are purely abiotic and free of biological influence has been misleading. In recent years this notion has been challenged by overwhelming evidence that biological processes occurring at microscopic scales can influence macroscopic geotechnical properties, even in en...
Article
Full-text available
Microbially induced calcite precipitation (MICP) is a bio-mediated cementation process that improves the geotechnical properties of soils through the precipitation of calcite at soil particle contacts. This study presents a field-scale, surficial application of MICP to improve the erosion resistance of loose sand deposits and provide surface stabil...
Conference Paper
Full-text available
Microbially Induced Calcite Precipitation (MICP) is a bio-mediated cementation process that improves the geotechnical properties of soils. The current study presents a field-scale, surficial application of MICP to improve the erosion resistance of loose, sandy soils and provide surface stabilization for dust control and future re-vegetation. Three...

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