Biogrouting coarse materials using soil-lift treatment strategy

Mahawish, Aamir, Bouazza, Abdelmalek and Gates, Will P. 2016, Biogrouting coarse materials using soil-lift treatment strategy, Canadian geotechnical journal, vol. 53, no. 12, pp. 2080-2085, doi: 10.1139/cgj-2016-0167.

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Title Biogrouting coarse materials using soil-lift treatment strategy
Author(s) Mahawish, Aamir
Bouazza, Abdelmalek
Gates, Will P.ORCID iD for Gates, Will P.
Journal name Canadian geotechnical journal
Volume number 53
Issue number 12
Start page 2080
End page 2085
Total pages 6
Publisher NRC Research Press
Place of publication Ottawa, Ont.
Publication date 2016-12
ISSN 0008-3674
Keyword(s) biogrout
coarse sand
microbial-induced calcite precipitation (MICP)
Summary This paper investigates the feasibility of using a soil-lift biogrouting treatment strategy to improve the mechanical properties of coarse sand with the view of applying it to stone columns – sand piles and rammed earth columns type of applications. A two-phase percolation approach was adopted in this study that included percolating a bacterial suspension Sporosarcina pasteurii in the first phase and a cementation solution in the second phase. This process was repeated every two treatments. The study reveals that an increase in the number of soil lifts negatively influenced the mechanical properties of the biocemented coarse sand. However, the minimum strength and stiffness achieved (2.8 MPa) in this study was sufficient to mitigate slumping of a soil column that may occur during installation or excessive radial expansion. Furthermore, it is shown that a single lift treatment can lead to a very high increase in strength and stiffness (up to 8.9 MPa and 2.3 GPa, respectively). However, calcite distributions within biocemented soil columns piles were quite heterogeneous with increasing number of soil-lift treatments. Soil-lift treatment can be seen as a practical strategy that can be used to inject treatment liquids in deeper depths, such as in soil columns piles.
Language eng
DOI 10.1139/cgj-2016-0167
Field of Research 0905 Civil Engineering
0907 Environmental Engineering
Socio Economic Objective 0 Not Applicable
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2016, Canadian Science Publishing
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