Model tests on biogrouted granular columns in soft soil Mahawish, A, Bouazza, A and Gates, Will 2021, Model tests on biogrouted granular columns in soft soil, Canadian Geotechnical Journal, vol. 58, no. 12, pp. 1855-1869, doi: 10.1139/cgj-2020-0361. Title Model tests on biogrouted granular columns in soft soil Author(s) Mahawish, A Bouazza, A Gates, Will orcid.org/0000-0001-7388-0289 Journal name Canadian Geotechnical Journal Volume number 58 Issue number 12 Start page 1855 End page 1869 Total pages 14 Publisher Canadian Science Publishing Place of publication Ottawa, Canada Publication date 2021-12 ISSN 0008-3674 1208-6010 Summary This paper examines the possible use of a bio-cementation process to reduce excessive bulging that occurs during the loading of granular columns in soft clays. A 12-phase percolation bio-chemical treatment technique was used to bio-cement part of the columns targeting the columns upper section, where bulging usually occurs. Upon application of unit cell surface loads up to 350 kPa, placement of a bio-cemented granular column substantially reduced the vertical strains by 43% to 48% compared with an un-cemented granular column and 56% to 60% compared with unreinforced kaolin clay for just a low replacement ratio of 11%. Bulging was reduced by 62% to 75% following bio-cementation and mostly occurred where bio-cementation was less evident. Scanning electron microscopy and energy dispersive spectroscopy validated the existence of calcium carbonate. This study presents a relatively new alternative to reducing bulging in granular columns using a promising approach. Language eng DOI 10.1139/cgj-2020-0361 Field of Research 0905 Civil Engineering 0907 Environmental Engineering HERDC Research category C1 Refereed article in a scholarly journal Persistent URL http://hdl.handle.net/10536/DRO/DU:30160537 Document type: Journal Article Collections: Institute for Frontier Materials GTP Research Related Links Link Description Connect to published version Go to link with your DU access privileges   Connect to Elements publication management system Go to link with your DU access privileges     Unless expressly stated otherwise, the copyright for items in DRO is owned by the author, with all rights reserved. Versions Version Filter Type Fri, 31 Dec 2021, 14:21:09 EST Fri, 31 Dec 2021, 14:53:09 EST Thu, 05 May 2022, 09:35:47 EST Tue, 10 May 2022, 11:32:53 EST Tue, 10 May 2022, 14:41:33 EST Tue, 10 May 2022, 14:45:36 EST Filtered Full Citation counts:   Cited 0 times in TR Web of Science Cited 1 times in Scopus Search Google Scholar Access Statistics: 16 Abstract Views  -  Detailed Statistics Created: Fri, 31 Dec 2021, 14:21:09 EST