|
Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Engineering / Faculty of Engineering >
Peer-reviewed Journal Articles, etc >
Effect of Scallop Powder Addition on MICP Treatment of Amorphous Peat
| Title: | Effect of Scallop Powder Addition on MICP Treatment of Amorphous Peat |
| Authors: | Gowthaman, Sivakumar Browse this author | | Chen, Meiqi Browse this author | | Nakashima, Kazunori Browse this author | | Kawasaki, Satoru Browse this author →KAKEN DB |
| Keywords: | microbial-induced carbonate precipitation (MICP) | | amorphous peat | | scallop shell powder | | stabilization | | unconfined compressive strength |
| Issue Date: | 12-Jul-2021 |
| Publisher: | Frontiers Media |
| Journal Title: | Frontiers in Environmental Science |
| Volume: | 9 |
| Start Page: | 690376 |
| Publisher DOI: | 10.3389/fenvs.2021.690376 |
| Abstract: | Peat is one of the most challenging and problematic soils in the fields of geotechnical and environmental engineering. The most critical problems related to peat soils are extremely low strength and high compressibility, resulting in poor inhabitancy and infrastructural developments in their vicinity. Thus far, peat soils were stabilized using Portland cement; however, the production of Portland cement causes significant emission of greenhouse gases, which is not environmentally desirable. Microbial-induced carbonate precipitation (MICP) is an innovative technique for improving the mechanical properties of soil through potentially environmentally friendly processes. This article presents a laboratory study carried out with the aim of investigating the viability and effect of scallop shell powder (SSP) on enhancing the mechanical properties of the MICP-treated amorphous peat. The hypothesis was that the distribution of SSP (as-derived calcite particles) would (i) provide more nucleation sites to precipitates and (ii) increase the connectivity of MICP bridges to facilitate mineral skeleton to amorphous peat, accompanied by an increase in its compressive strength. Specimens were treated at varying combinations of SSP and MICP reagents, and the improvement was comprehensively assessed through a series of unconfined compression tests and supported by microscale and chemical analyses such as scanning electron microscopy, energy-dispersive X-ray analysis, and X-ray diffraction analysis. The outcomes showed that incorporating SSP in MICP treatment would be a promising approach to treat amorphous peat soils. The proposed approach could improve the unconfined compressive strength by over 200% after a 7-day curing period, while the conventional MICP could not exhibit any significant improvements. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/82557 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
|
|
