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Technical Papers
Feb 28, 2019

Enhancement of Coal Ash Compressibility Parameters Using Microbial-Induced Carbonate Precipitation

Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 145, Issue 5

Abstract

Microbial-induced calcium carbonate precipitation (MICP) was experimentally implemented on two coal ash materials (i.e., CA1 and CA3) to investigate the efficacy of the treatment on the hydraulic and compressibility properties of the material. Oedometers used in testing were modified to enable the injection of treatment solutions and to provide the ability to monitor shear wave velocity. The coal ash specimens were treated to reach different levels of shear wave velocity, which corresponded to varying amounts of CaCO3 content. The hydraulic conductivity and shear wave velocity values were assessed throughout the loading process. Results indicate that the MICP treatment decreased the compressibility (compression index decreased by a factor as high as 2), and the hydraulic conductivity (decreased by a factor as much as 0.05). The slope of log(σV)-VS relationship (β) decreased from 0.31 for the untreated material to 0.01 with treatment. In parallel, the increase in the shear wave velocity after treatment increased the intercept of the relationship between log(σV)-VS (i.e., α) from 38 to 383  m/s. The correlation between small-strain and large-strain parameters are explored and discussed.

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Acknowledgments

Funding from the National Science Foundation (CMMI #1554056) and the Electric Power Research Institute is appreciated. Any opinions, findings, and conclusions or recommendations expressed are those of the authors and do not necessarily reflect the views of the funding agencies. This work was performed in part at the Analytical Instrumentation Facility (AIF) at North Carolina State University, which is supported by the State of North Carolina and the National Science Foundation (ECCS #1542015). The AIF is a member of the North Carolina Research Triangle Nanotechnology Network (RTNN), a site in the National Nanotechnology Coordinated Infrastructure (NNCI).

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Go to Journal of Geotechnical and Geoenvironmental Engineering
Journal of Geotechnical and Geoenvironmental Engineering
Volume 145Issue 5May 2019

History

Received: May 13, 2018
Accepted: Oct 12, 2018
Published online: Feb 28, 2019
Published in print: May 1, 2019
Discussion open until: Jul 28, 2019

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Authors

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Brina M. Montoya, M.ASCE [email protected]
Assistant Professor, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Raleigh, NC 27695 (corresponding author). Email: [email protected]
Postdoctoral Researcher, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Raleigh, NC 27695. ORCID: https://orcid.org/0000-0002-6091-1952. Email: [email protected]
Mohammed A. Gabr, F.ASCE [email protected]
Distinguished Professor of Civil Engineering and Construction, Dept. of Civil, Construction, and Environmental Engineering, North Carolina State Univ., Raleigh, NC 27695. Email: [email protected]

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