Co-encapsulation of bacterial spores and nutrients by polyethylene glycol for self-sealing cementitious composites
Co-encapsulation of endospores and nutrients in self-healing concrete can mitigate their negative effects on cement hydration. However, the current approaches of co-encapsulation for bacteria-based self-healing cementitious composites could cause pre-consumption of nutrients before cracking or a res...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/180798 |
| _version_ | 1826126503379730432 |
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| author | Feng, Jianhang Dai, Xiaodi Qian, Shunzhi |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Feng, Jianhang Dai, Xiaodi Qian, Shunzhi |
| author_sort | Feng, Jianhang |
| collection | NTU |
| description | Co-encapsulation of endospores and nutrients in self-healing concrete can mitigate their negative effects on cement hydration. However, the current approaches of co-encapsulation for bacteria-based self-healing cementitious composites could cause pre-consumption of nutrients before cracking or a restricted release of nutrients after cracking. To address the nutrient release issue, polyethylene glycol (PEG) with high solubility was applied as an alternative to co-encapsulation of bacterial spores and nutrients, subsequently coated by an epoxy/sand protective shell herein. The core-shell structured capsules rapidly released the encapsulated substances within approximately 4 h and protected the encapsulated endospores in alkali environments. Due to the co-encapsulation, hydration retardation was avoided, leading to less severe reductions in compressive strength. After cracking, although the released amount of nutrients decreased after encapsulation, the closure of cracks below 300 μm was improved in the presence of capsules, thus water tightness was recovered more significantly. A model was developed to simulate sealing evolutions, and the modelling results were generally consistent with the experimental results. |
| first_indexed | 2025-03-09T14:19:04Z |
| format | Journal Article |
| id | ntu-10356/180798 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-03-09T14:19:04Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1807982024-10-28T02:06:06Z Co-encapsulation of bacterial spores and nutrients by polyethylene glycol for self-sealing cementitious composites Feng, Jianhang Dai, Xiaodi Qian, Shunzhi School of Civil and Environmental Engineering Engineering Bacterial spores Co-encapsulation Co-encapsulation of endospores and nutrients in self-healing concrete can mitigate their negative effects on cement hydration. However, the current approaches of co-encapsulation for bacteria-based self-healing cementitious composites could cause pre-consumption of nutrients before cracking or a restricted release of nutrients after cracking. To address the nutrient release issue, polyethylene glycol (PEG) with high solubility was applied as an alternative to co-encapsulation of bacterial spores and nutrients, subsequently coated by an epoxy/sand protective shell herein. The core-shell structured capsules rapidly released the encapsulated substances within approximately 4 h and protected the encapsulated endospores in alkali environments. Due to the co-encapsulation, hydration retardation was avoided, leading to less severe reductions in compressive strength. After cracking, although the released amount of nutrients decreased after encapsulation, the closure of cracks below 300 μm was improved in the presence of capsules, thus water tightness was recovered more significantly. A model was developed to simulate sealing evolutions, and the modelling results were generally consistent with the experimental results. Ministry of Education (MOE) Nanyang Technological University The first author would like to appreciate the support of NTU PhD scholarship. The authors would like to acknowledge the financial support from the Ministry of Education, Singapore, under its Academic Research Fund Tier 1 (RG71/20). 2024-10-28T02:06:06Z 2024-10-28T02:06:06Z 2024 Journal Article Feng, J., Dai, X. & Qian, S. (2024). Co-encapsulation of bacterial spores and nutrients by polyethylene glycol for self-sealing cementitious composites. Cement and Concrete Composites, 153, 105713-. https://dx.doi.org/10.1016/j.cemconcomp.2024.105713 0958-9465 https://hdl.handle.net/10356/180798 10.1016/j.cemconcomp.2024.105713 2-s2.0-85201224033 153 105713 en RG71/20 Cement and Concrete Composites © 2024 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies. |
| spellingShingle | Engineering Bacterial spores Co-encapsulation Feng, Jianhang Dai, Xiaodi Qian, Shunzhi Co-encapsulation of bacterial spores and nutrients by polyethylene glycol for self-sealing cementitious composites |
| title | Co-encapsulation of bacterial spores and nutrients by polyethylene glycol for self-sealing cementitious composites |
| title_full | Co-encapsulation of bacterial spores and nutrients by polyethylene glycol for self-sealing cementitious composites |
| title_fullStr | Co-encapsulation of bacterial spores and nutrients by polyethylene glycol for self-sealing cementitious composites |
| title_full_unstemmed | Co-encapsulation of bacterial spores and nutrients by polyethylene glycol for self-sealing cementitious composites |
| title_short | Co-encapsulation of bacterial spores and nutrients by polyethylene glycol for self-sealing cementitious composites |
| title_sort | co encapsulation of bacterial spores and nutrients by polyethylene glycol for self sealing cementitious composites |
| topic | Engineering Bacterial spores Co-encapsulation |
| url | https://hdl.handle.net/10356/180798 |
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