Viability of bacterial spores and crack healing in bacteria-containing geopolymer
Geopolymer is an emerging alternative green binder to Portland cement. Geopolymer is often more brittle and thus it is highly desirable to impart self-healing into geopolymer. Unlike Portland cement concrete, self-healing through hydration of cement, and leaching and carbonation of hydration product...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Online Access: | https://hdl.handle.net/10356/139512 |
| _version_ | 1811684264239955968 |
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| author | Jadhav, Umesh U. Lahoti, Mukund Chen, Zhitao Qiu, Jishen Cao, Bin Yang, En-Hua |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Jadhav, Umesh U. Lahoti, Mukund Chen, Zhitao Qiu, Jishen Cao, Bin Yang, En-Hua |
| author_sort | Jadhav, Umesh U. |
| collection | NTU |
| description | Geopolymer is an emerging alternative green binder to Portland cement. Geopolymer is often more brittle and thus it is highly desirable to impart self-healing into geopolymer. Unlike Portland cement concrete, self-healing through hydration of cement, and leaching and carbonation of hydration products are not feasible in geopolymer. Microbially induced carbonate precipitation (MICP)-enabled sealing is therefore a potential way to engage self-healing in geopolymer. Using Sporosarcina pasteurii as a model MICP bacterium, this paper investigated viability of bacterial spores in a metakaolin-based geopolymer and crack healing in bacteria-containing geopolymer. Spores of S. pasteurii were added into geopolymer mix directly without encapsulation or immobilization. Results showed that bacterial spores did not leak out from the geopolymer matrix and the spores remained viable in the metakaolin-based geopolymer. Cracks in bacteria-containing geopolymer were sealed with CaCO3 after conditioning in precipitation medium for 3 days, which suggests bacterial spores remain viable. The microstructure of metakaolin-based geopolymer is controlled by Si/Al, Na/Al, and H2O/Na2O molar ratio and less depend on age, which allows direct addition of bacteria into geopolymer mix without encapsulation or immobilization to engage MCP-induced self-healing in geopolymer. |
| first_indexed | 2024-10-01T04:25:52Z |
| format | Journal Article |
| id | ntu-10356/139512 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:25:52Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1395122020-05-20T03:10:10Z Viability of bacterial spores and crack healing in bacteria-containing geopolymer Jadhav, Umesh U. Lahoti, Mukund Chen, Zhitao Qiu, Jishen Cao, Bin Yang, En-Hua School of Civil and Environmental Engineering Engineering::Civil engineering Metakaolin Geopolymer Geopolymer is an emerging alternative green binder to Portland cement. Geopolymer is often more brittle and thus it is highly desirable to impart self-healing into geopolymer. Unlike Portland cement concrete, self-healing through hydration of cement, and leaching and carbonation of hydration products are not feasible in geopolymer. Microbially induced carbonate precipitation (MICP)-enabled sealing is therefore a potential way to engage self-healing in geopolymer. Using Sporosarcina pasteurii as a model MICP bacterium, this paper investigated viability of bacterial spores in a metakaolin-based geopolymer and crack healing in bacteria-containing geopolymer. Spores of S. pasteurii were added into geopolymer mix directly without encapsulation or immobilization. Results showed that bacterial spores did not leak out from the geopolymer matrix and the spores remained viable in the metakaolin-based geopolymer. Cracks in bacteria-containing geopolymer were sealed with CaCO3 after conditioning in precipitation medium for 3 days, which suggests bacterial spores remain viable. The microstructure of metakaolin-based geopolymer is controlled by Si/Al, Na/Al, and H2O/Na2O molar ratio and less depend on age, which allows direct addition of bacteria into geopolymer mix without encapsulation or immobilization to engage MCP-induced self-healing in geopolymer. MOE (Min. of Education, S’pore) 2020-05-20T03:10:10Z 2020-05-20T03:10:10Z 2018 Journal Article Jadhav, U. U., Lahoti, M., Chen, Z., Qiu, J., Cao, B., & Yang, E.-H. (2018). Viability of bacterial spores and crack healing in bacteria-containing geopolymer. Construction and Building Materials, 169, 716-723. doi:10.1016/j.conbuildmat.2018.03.039 0950-0618 https://hdl.handle.net/10356/139512 10.1016/j.conbuildmat.2018.03.039 2-s2.0-85043368823 169 716 723 en Construction and Building Materials © 2018 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Metakaolin Geopolymer Jadhav, Umesh U. Lahoti, Mukund Chen, Zhitao Qiu, Jishen Cao, Bin Yang, En-Hua Viability of bacterial spores and crack healing in bacteria-containing geopolymer |
| title | Viability of bacterial spores and crack healing in bacteria-containing geopolymer |
| title_full | Viability of bacterial spores and crack healing in bacteria-containing geopolymer |
| title_fullStr | Viability of bacterial spores and crack healing in bacteria-containing geopolymer |
| title_full_unstemmed | Viability of bacterial spores and crack healing in bacteria-containing geopolymer |
| title_short | Viability of bacterial spores and crack healing in bacteria-containing geopolymer |
| title_sort | viability of bacterial spores and crack healing in bacteria containing geopolymer |
| topic | Engineering::Civil engineering Metakaolin Geopolymer |
| url | https://hdl.handle.net/10356/139512 |
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