Effect of biocarriers on microbially induced carbonate precipitation for sand reinforcement.
Saved in:
| Title: | Effect of biocarriers on microbially induced carbonate precipitation for sand reinforcement. |
|---|---|
| Authors: | Yang, Guokun1 (AUTHOR), Zheng, Shaojun1,2 (AUTHOR), Liu, Tianle1 (AUTHOR) liutianle@cug.edu.cn, Luo, Enhao1 (AUTHOR), Tang, Chengxiang1 (AUTHOR), Qu, Bo3 (AUTHOR), Lei, Gang1 (AUTHOR), Jiang, Guosheng1 (AUTHOR) |
| Source: | Acta Geotechnica. Jul2025, Vol. 20 Issue 7, p3615-3632. 18p. |
| Subjects: | Soil stabilization, Calcium carbonate, Biomineralization, Soils, Biomimetic materials, Flow simulations, Immobilized cells |
| Abstract: | Enhancing the efficiency of microbially induced carbonate precipitation (MICP) for soil stabilization is of significant importance for reducing costs and shortening construction timelines, ultimately improving the applicability of MICP technology in engineering. This study developed a novel biocarrier material (Dia@AP-DE) to enhance the efficiency of MICP in cementing sand by immobilizing microorganisms and diversifying calcium carbonate cementation forms. Dia@AP-DE was chemically modified to graft –NH2 groups onto its surface. These groups protonate to form positively charged –NH3+ groups, enabling the tight adsorption of negatively charged bacteria through Coulombic interactions. MICP was applied to reinforce sand columns from group B (free bacteria) and group BDAD (Dia@AP-DE immobilized bacteria), and a series of experiments were conducted to analyze the biocarrier's effects on cementation efficiency, calcium carbonate morphology, and pore structure. Additionally, flow channel evolution within the sand columns was simulated using AVIZO software. The results showed that the BDAD group formed more diverse calcium carbonate cementation forms, particularly the formation of "calcium carbonate bridges." The bacteria immobilized on Dia@AP-DE produced additional layers of calcium carbonate, which acted as bridges between sand particles, reducing the distance required for effective cementation. Furthermore, flow simulation results indicated that the "calcium carbonate bridges" optimized the uniformity of flow channels within the sand columns during the early stages of injection. Unconfined compressive strength (UCS) tests showed that the strength of the BDAD group was significantly improved at all injection cycles, with UCS values of 1.02 MPa and 5.88 MPa after 3 and 11 injections, respectively, which were 4.6 and 2.0 times higher than those of B group. This study provides a potential new approach for enhancing the efficiency of biocemented soils. [ABSTRACT FROM AUTHOR] |
| Copyright of Acta Geotechnica is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
|
Full text is not displayed to guests.
Login for full access.
|
|
| Abstract: | Enhancing the efficiency of microbially induced carbonate precipitation (MICP) for soil stabilization is of significant importance for reducing costs and shortening construction timelines, ultimately improving the applicability of MICP technology in engineering. This study developed a novel biocarrier material (Dia@AP-DE) to enhance the efficiency of MICP in cementing sand by immobilizing microorganisms and diversifying calcium carbonate cementation forms. Dia@AP-DE was chemically modified to graft –NH2 groups onto its surface. These groups protonate to form positively charged –NH3+ groups, enabling the tight adsorption of negatively charged bacteria through Coulombic interactions. MICP was applied to reinforce sand columns from group B (free bacteria) and group BDAD (Dia@AP-DE immobilized bacteria), and a series of experiments were conducted to analyze the biocarrier's effects on cementation efficiency, calcium carbonate morphology, and pore structure. Additionally, flow channel evolution within the sand columns was simulated using AVIZO software. The results showed that the BDAD group formed more diverse calcium carbonate cementation forms, particularly the formation of "calcium carbonate bridges." The bacteria immobilized on Dia@AP-DE produced additional layers of calcium carbonate, which acted as bridges between sand particles, reducing the distance required for effective cementation. Furthermore, flow simulation results indicated that the "calcium carbonate bridges" optimized the uniformity of flow channels within the sand columns during the early stages of injection. Unconfined compressive strength (UCS) tests showed that the strength of the BDAD group was significantly improved at all injection cycles, with UCS values of 1.02 MPa and 5.88 MPa after 3 and 11 injections, respectively, which were 4.6 and 2.0 times higher than those of B group. This study provides a potential new approach for enhancing the efficiency of biocemented soils. [ABSTRACT FROM AUTHOR] |
|---|---|
| ISSN: | 18611125 |
| DOI: | 10.1007/s11440-025-02598-8 |
