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.
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 language | English |
|---|---|
| Title of host publication | Final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions |
| Editors | A. Bertron, H. Jonkers |
| Publisher | RILEM |
| Pages | 433-444 |
| Number of pages | 11 |
| Volume | 2 |
| ISBN (Print) | 978-2-35158-210-7 |
| Publication status | Published - 24 Jun 2018 |
| Event | Final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions - Toulouse, France Duration: 25 Jun 2018 → 28 Jun 2018 https://rilem-mci2018.sciencesconf.org/ |
Conference
| Conference | Final Conference of RILEM TC 253-MCI: Microorganisms-Cementitious Materials Interactions |
|---|---|
| Country/Territory | France |
| City | Toulouse |
| Period | 25/06/18 → 28/06/18 |
| Internet address |
Keywords
- Bacillus Megaterium
- nutrient broth
- soil
- compressive strength
- strengthening/stabilisation
- calcite precipitation