Influence of Microbe and Enzyme-Induced Treatments on Cemented Sand Shear Response
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 145, Issue 9
Abstract
Microbial-induced calcium carbonate precipitation (MICP) and enzyme-induced calcium carbonate precipitation (EICP) are both soil improvement techniques that improve the shear response of sands. However, the source of urease to hydrolyze the urea is different between the two techniques, and these differences may result in different shear responses. The macro- and microscale behavior of MICP- and EICP-treated sands are evaluated using triaxial tests and scanning electron microscopy (SEM) images. To compare the macroscale behavior, triaxial specimens were treated using MICP and EICP techniques to reach a moderate level of cementation, assessed using shear wave velocity. EICP-treated sand needs less calcium carbonate than MICP-treated sand to reach the same shear wave velocity. The specimens were sheared under drained conditions, and shear responses are compared. The obtained results show that a higher shear strength and larger dilative strain were observed for MICP-treated sand compared to EICP-treated sand when treated to the same shear wave velocity; however, more injections were required for the MICP treatment, which resulted in a higher carbonate content. The SEM images revealed that the shape and structure of precipitated is different in these two treatment techniques, which in turn likely influenced the macroscale response. The advantages of each method are also discussed.
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Acknowledgments
Funding from the National Science Foundation (CMMI Nos. 1537007 and 1554056) is appreciated. Any opinions, findings, and conclusions or recommendations expressed are those of the authors and do not necessarily reflect the views of the National Science Foundation. 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 No. 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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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 145 • Issue 9 • September 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Jul 18, 2018
Accepted: Mar 20, 2019
Published online: Jun 28, 2019
Published in print: Sep 1, 2019
Discussion open until: Nov 28, 2019
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