Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites
High pH in cracks depresses activities of bacteria even after they are protected well in cement-based materials, thereby restricting bacteria-based autonomous healing. To resolve this problem, graphene oxide was added to hydrogels encapsulating endospores for self-healing cementitious composites. Du...
| 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/10356/179154 |
| _version_ | 1811688574231248896 |
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| author | Feng, Jianhang Radhiah Elyssa Binte Rohaizat Qian, Shunzhi |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Feng, Jianhang Radhiah Elyssa Binte Rohaizat Qian, Shunzhi |
| author_sort | Feng, Jianhang |
| collection | NTU |
| description | High pH in cracks depresses activities of bacteria even after they are protected well in cement-based materials, thereby restricting bacteria-based autonomous healing. To resolve this problem, graphene oxide was added to hydrogels encapsulating endospores for self-healing cementitious composites. Due to the graphene oxide incorporation, breakage ratios of hydrogels upon cracking were increased thus graphene oxide could be released to cracks. Thereafter, pH was declined to around 9 at crack mouths, where metabolic activities of bacteria were improved. Owing to the improved activities, bacteria-mediated calcium carbonate in cracks was expedited, thereby accelerating crack closure and water permeability reduction. Furthermore, flexural strength was completely restored in the presence of graphene oxide, which could be associated with needle-like morphology of generated calcium carbonate in cracks. With the outstanding self-healing performance, carbon emissions of the cementitious composites experiencing 150–400 μm wide cracks were reduced at a cradle-to-grave boundary, due to their extended service life. |
| first_indexed | 2024-10-01T05:34:22Z |
| format | Journal Article |
| id | ntu-10356/179154 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:34:22Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1791542024-07-22T04:36:40Z Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites Feng, Jianhang Radhiah Elyssa Binte Rohaizat Qian, Shunzhi School of Civil and Environmental Engineering Engineering Self-healing concrete Graphene oxide High pH in cracks depresses activities of bacteria even after they are protected well in cement-based materials, thereby restricting bacteria-based autonomous healing. To resolve this problem, graphene oxide was added to hydrogels encapsulating endospores for self-healing cementitious composites. Due to the graphene oxide incorporation, breakage ratios of hydrogels upon cracking were increased thus graphene oxide could be released to cracks. Thereafter, pH was declined to around 9 at crack mouths, where metabolic activities of bacteria were improved. Owing to the improved activities, bacteria-mediated calcium carbonate in cracks was expedited, thereby accelerating crack closure and water permeability reduction. Furthermore, flexural strength was completely restored in the presence of graphene oxide, which could be associated with needle-like morphology of generated calcium carbonate in cracks. With the outstanding self-healing performance, carbon emissions of the cementitious composites experiencing 150–400 μm wide cracks were reduced at a cradle-to-grave boundary, due to their extended service life. 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). 2024-07-22T04:36:40Z 2024-07-22T04:36:40Z 2024 Journal Article Feng, J., Radhiah Elyssa Binte Rohaizat & Qian, S. (2024). Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites. Cement and Concrete Composites, 151, 105596-. https://dx.doi.org/10.1016/j.cemconcomp.2024.105596 0958-9465 https://hdl.handle.net/10356/179154 10.1016/j.cemconcomp.2024.105596 2-s2.0-85194543862 151 105596 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 Self-healing concrete Graphene oxide Feng, Jianhang Radhiah Elyssa Binte Rohaizat Qian, Shunzhi Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites |
| title | Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites |
| title_full | Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites |
| title_fullStr | Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites |
| title_full_unstemmed | Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites |
| title_short | Unveiling the impact of graphene oxide on bacteria-based autonomous healing of cracks in cementitious composites |
| title_sort | unveiling the impact of graphene oxide on bacteria based autonomous healing of cracks in cementitious composites |
| topic | Engineering Self-healing concrete Graphene oxide |
| url | https://hdl.handle.net/10356/179154 |
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