The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends
This study investigated the feasibility of crack healing by means of microbial induced carbonate precipitation (MICP) in reactive magnesia cement (RMC)-based blends. Pre-cracked samples were subjected to four different healing conditions involving air, water and two different bacteria-urea concentra...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/150631 |
| _version_ | 1811695702095429632 |
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| author | Ruan, Shaoqin Qiu, Jishen Weng, Yiwei Yang, Yang Yang, En-Hua Chu, Jian Unluer, Cise |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Ruan, Shaoqin Qiu, Jishen Weng, Yiwei Yang, Yang Yang, En-Hua Chu, Jian Unluer, Cise |
| author_sort | Ruan, Shaoqin |
| collection | NTU |
| description | This study investigated the feasibility of crack healing by means of microbial induced carbonate precipitation (MICP) in reactive magnesia cement (RMC)-based blends. Pre-cracked samples were subjected to four different healing conditions involving air, water and two different bacteria-urea concentrations. Resonance frequency measurements revealed the recovery of samples under different conditions. μ-CT, SEM-EDX, XRD and pH measurements were used to investigate the type and contents of healing products within the cracks. Different types of hydrated magnesium carbonates (HMCs) formed under each bacteria-urea solution due to differences in pH associated with bacteria-urea concentrations. While these phases first formed on top of the cracks, investigation of the crack depth revealed the presence of precipitates at inner sections, albeit at lower contents. The adopted MICP approach leading to the production of HMCs was an effective method for healing cracks in RMC-based samples, resulting in a high extent of healing in a short time period. |
| first_indexed | 2024-10-01T07:27:40Z |
| format | Journal Article |
| id | ntu-10356/150631 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:27:40Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | ntu-10356/1506312021-06-01T06:35:50Z The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends Ruan, Shaoqin Qiu, Jishen Weng, Yiwei Yang, Yang Yang, En-Hua Chu, Jian Unluer, Cise School of Civil and Environmental Engineering Singapore Centre for 3D Printing Engineering::Civil engineering MgO Bacteria This study investigated the feasibility of crack healing by means of microbial induced carbonate precipitation (MICP) in reactive magnesia cement (RMC)-based blends. Pre-cracked samples were subjected to four different healing conditions involving air, water and two different bacteria-urea concentrations. Resonance frequency measurements revealed the recovery of samples under different conditions. μ-CT, SEM-EDX, XRD and pH measurements were used to investigate the type and contents of healing products within the cracks. Different types of hydrated magnesium carbonates (HMCs) formed under each bacteria-urea solution due to differences in pH associated with bacteria-urea concentrations. While these phases first formed on top of the cracks, investigation of the crack depth revealed the presence of precipitates at inner sections, albeit at lower contents. The adopted MICP approach leading to the production of HMCs was an effective method for healing cracks in RMC-based samples, resulting in a high extent of healing in a short time period. Ministry of Education (MOE) The authors would like to acknowledge the financial support from the Singapore MOE Academic Research Fund Tier 1 (RG 95/16) for the work performed by Shaoqin Ruan and Cise Unluer. The support from MOE Academic Research Fund Tier 2 (MOE2015-T2-142) is also acknowledged for the work performed by Yang Yang and Jian Chu. 2021-06-01T06:35:49Z 2021-06-01T06:35:49Z 2019 Journal Article Ruan, S., Qiu, J., Weng, Y., Yang, Y., Yang, E., Chu, J. & Unluer, C. (2019). The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends. Cement and Concrete Research, 115, 176-188. https://dx.doi.org/10.1016/j.cemconres.2018.10.018 0008-8846 0000-0001-5637-1415 https://hdl.handle.net/10356/150631 10.1016/j.cemconres.2018.10.018 2-s2.0-85055479561 115 176 188 en RG 95/16 MOE2015-T2-142 Cement and Concrete Research © 2018 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering MgO Bacteria Ruan, Shaoqin Qiu, Jishen Weng, Yiwei Yang, Yang Yang, En-Hua Chu, Jian Unluer, Cise The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends |
| title | The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends |
| title_full | The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends |
| title_fullStr | The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends |
| title_full_unstemmed | The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends |
| title_short | The use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement-based blends |
| title_sort | use of microbial induced carbonate precipitation in healing cracks within reactive magnesia cement based blends |
| topic | Engineering::Civil engineering MgO Bacteria |
| url | https://hdl.handle.net/10356/150631 |
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