Soil bio-cementation using a new one-phase low-pH injection method
Soil bio-cementation via microbially induced carbonate precipitation (MICP) has been extensively studied as a promising alternative technique to traditional chemical cementing agents for ground improvement. The multiple-phase injection methods are currently well adopted for MICP treatment, but it is...
| Main Authors: | , , |
|---|---|
| Format: | Journal Article |
| Published: |
2018
|
| Online Access: | http://hdl.handle.net/20.500.11937/71934 |
| _version_ | 1848762614079815680 |
|---|---|
| author | Cheng, L. Shahin, Mohamed Chu, J. |
| author_facet | Cheng, L. Shahin, Mohamed Chu, J. |
| author_sort | Cheng, L. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Soil bio-cementation via microbially induced carbonate precipitation (MICP) has been extensively studied as a promising alternative technique to traditional chemical cementing agents for ground improvement. The multiple-phase injection methods are currently well adopted for MICP treatment, but it is rather complex and requires excessive number of injections. This paper presents a novel one-phase injection method using low-pH all-in-one biocement solution (i.e. a mixture of bacterial culture, urea, and CaCl2). The key feature of this method is that the lag period of the bio-cementation process can be controlled by adjusting the biomass concentration, urease activity, and pH. This process prevents the clogging of bio-flocs formation and thus allows the biocement solution to be well distributed inside the soil matrix before bio-cementation takes effect, allowing a relatively uniform MICP treatment to be achieved. Furthermore, the ammonia gas release would be reduced by more than 90%, which represents a significant improvement in the environmental friendliness of the technology. The new one-phase method is also effective in terms of the mechanical property of MICP-treated soil; an unconfined compressive strength of 2.5 MPa was achieved for sand after six treatments. |
| first_indexed | 2025-11-14T10:50:22Z |
| format | Journal Article |
| id | curtin-20.500.11937-71934 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:50:22Z |
| publishDate | 2018 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-719342019-10-22T07:07:47Z Soil bio-cementation using a new one-phase low-pH injection method Cheng, L. Shahin, Mohamed Chu, J. Soil bio-cementation via microbially induced carbonate precipitation (MICP) has been extensively studied as a promising alternative technique to traditional chemical cementing agents for ground improvement. The multiple-phase injection methods are currently well adopted for MICP treatment, but it is rather complex and requires excessive number of injections. This paper presents a novel one-phase injection method using low-pH all-in-one biocement solution (i.e. a mixture of bacterial culture, urea, and CaCl2). The key feature of this method is that the lag period of the bio-cementation process can be controlled by adjusting the biomass concentration, urease activity, and pH. This process prevents the clogging of bio-flocs formation and thus allows the biocement solution to be well distributed inside the soil matrix before bio-cementation takes effect, allowing a relatively uniform MICP treatment to be achieved. Furthermore, the ammonia gas release would be reduced by more than 90%, which represents a significant improvement in the environmental friendliness of the technology. The new one-phase method is also effective in terms of the mechanical property of MICP-treated soil; an unconfined compressive strength of 2.5 MPa was achieved for sand after six treatments. 2018 Journal Article http://hdl.handle.net/20.500.11937/71934 10.1007/s11440-018-0738-2 fulltext |
| spellingShingle | Cheng, L. Shahin, Mohamed Chu, J. Soil bio-cementation using a new one-phase low-pH injection method |
| title | Soil bio-cementation using a new one-phase low-pH injection method |
| title_full | Soil bio-cementation using a new one-phase low-pH injection method |
| title_fullStr | Soil bio-cementation using a new one-phase low-pH injection method |
| title_full_unstemmed | Soil bio-cementation using a new one-phase low-pH injection method |
| title_short | Soil bio-cementation using a new one-phase low-pH injection method |
| title_sort | soil bio-cementation using a new one-phase low-ph injection method |
| url | http://hdl.handle.net/20.500.11937/71934 |