Microbial Calcite Induced Precipitation Ground Strengthening with Minimum Cement Content

Alan Richardson, Ross Valentine, Max Abrahams, Dan Nicholson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.
Original languageEnglish
Title of host publicationFinal Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions
EditorsA. Bertron, H. Jonkers
PublisherRILEM
Pages433-444
Number of pages11
Volume2
ISBN (Print)978-2-35158-210-7
Publication statusPublished - 24 Jun 2018
EventFinal Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions - Toulouse, France
Duration: 25 Jun 201828 Jun 2018
https://rilem-mci2018.sciencesconf.org/

Conference

ConferenceFinal Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions
CountryFrance
CityToulouse
Period25/06/1828/06/18
Internet address

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