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Title: Strength and permeability of bentonite-assisted biocemented coarse sand
Authors: Ma, Guoliang
He, Xiang
Jiang, Xiang
Liu, Hanlong
Chu, Jian
Xiao, Yang
Keywords: Engineering::Civil engineering
Issue Date: 2021
Source: Ma, G., He, X., Jiang, X., Liu, H., Chu, J. & Xiao, Y. (2021). Strength and permeability of bentonite-assisted biocemented coarse sand. Canadian Geotechnical Journal, 58(7), 969-981.
Journal: Canadian Geotechnical Journal
Abstract: To effectively stabilize coarse sand, bentonite was introduced in microbially induced carbonate precipitation (MICP) grouting. Varying concentrations (0, 20, 40, and 80 g/L) of bentonite were added to bacterial suspensions (BSs), which were magnetically stirred to form bacterial-bentonite suspensions (BBSs). Then, coarse sand specimens were treated with BBSs and cementation solutions (CSs) to different cementation levels. The results showed that the addition of bentonite could increase the volume fractions of the precipitates consisting of calcium carbonate (CaCO3 ) and bentonite. The permeability decreased exponentially as the volume fraction of precipitates increased. As the active precipitates increased when a lower concentration (e.g., 20 g/L) of bentonite was added to the MICP grouting, the unconfined compressive strength (UCS) was substantially improved. However, detrimental effects were observed for specimens treated with a high concentration of bentonite. These results indicate that the effective concentration of natural clay aggregates used in MICP grouting was different for different engineering applications, e.g., seepage control and strength enhancement. The current work provides an encouraging method of improving the MICP technique.
ISSN: 0008-3674
DOI: 10.1139/cgj-2020-0045
Rights: © 2021 The author(s) or their institution(s). All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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