MICROBIAL CALCITE INDUCED PRECIPITATION GROUND STRENGTHENING WITH MINIMUM CEMENT CONTENT

Author(s): A.E. Richardson, R. Valentine, M. Abrahams and D. Nicholson
Paper category: Proceedings
Book title: Proceedings of the Final Conference of RILEM 253-MCI Microorganisms-Cementitious Materials Interactions Volume II
Editor(s): Alexandra Bertron and Henk Jonkers
ISBN: 978-2-35158-207-7 (Set)
ISBN: 978-2-35158-210-7 (Volume 2)
e-ISBN: 978-2-35158-206-0
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 433-443
Total Pages: 308
Language : English

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 precipitation medium food source through the soil sample and this is the recommendation for further tests.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00