Microbial Calcite Induced Precipitation Ground Strengthening with Minimum Cement Content

Richardson, Alan, Valentine, Ross, Abrahams, Max and Nicholson, Dan (2018) Microbial Calcite Induced Precipitation Ground Strengthening with Minimum Cement Content. In: Final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions. RILEM, pp. 433-444. ISBN 978-2-35158-210-7

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Abstract

There is a need for an eco friendly ground stabilisation/strengthening technique that reduces cement or lime use in soil mixing to achieve a suitable sub strata.
Microbial calcite induced precipitation used as a ground strengthening technique was examined in non cohesive soils. The bacillus bacteria need a pH value of around 10 to work effectively and therefore minimum cement contents were used to find the optimal cement content that would activate the bacteria to produce calcite as a binder. The optimal cement content was found to be 5% and this cement content also provided a binding role in the soil matrix.
Results showed an increase in strength due to the application of a bacteria in a food source and this effect was enhanced when the soil was stored at 30⁰C.
The test procedure should be changed to allow for a recycled flow of activated bacteria and nutrient broth food source through the soil sample and this is the recommendation for further tests.

Item Type:	Book Section
Subjects:	H200 Civil Engineering
Department:	Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User:	Becky Skoyles
Date Deposited:	29 Jun 2018 07:54
Last Modified:	11 Oct 2019 20:00
URI:	http://nrl.northumbria.ac.uk/id/eprint/34751

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