Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium
High strength engineered cementitious composites (ECC) that fracture under tensile stress present cracks with the width over 100 μm, which may not be easily repaired by autogenous healing. Herein, this study investigated the healing efficiency of high strength ECC after being immersed in bacteria-fr...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/160669 |
| _version_ | 1811690476810534912 |
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| author | Feng, Jianhang Chua, Song Xing Yang, Fan Qian, Shunzhi |
| author2 | School of Civil and Environmental Engineering |
| author_facet | School of Civil and Environmental Engineering Feng, Jianhang Chua, Song Xing Yang, Fan Qian, Shunzhi |
| author_sort | Feng, Jianhang |
| collection | NTU |
| description | High strength engineered cementitious composites (ECC) that fracture under tensile stress present cracks with the width over 100 μm, which may not be easily repaired by autogenous healing. Herein, this study investigated the healing efficiency of high strength ECC after being immersed in bacteria-free medium which is waste medium during spore cultivation. During incubation of bacteria, concentration of carbonate ions in the medium could rise to 0.30 mol/L approximately. These carbonate ions can be leveraged in calcium carbonate precipitation process for crack healing, which contributed to greater reduction of crack width of ECC specimens in waste medium than that in water. The superior crack closure led to the recovery of water tightness by lowering down the water absorption of cracked specimens and the restoration of tensile properties including both tensile strength and ultimate strain even after final failure of specimens. Therefore, it can be concluded that bacteria-free waste medium is promising to promote healing of concrete cracks. |
| first_indexed | 2024-10-01T06:04:36Z |
| format | Journal Article |
| id | ntu-10356/160669 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:04:36Z |
| publishDate | 2022 |
| record_format | dspace |
| spelling | ntu-10356/1606692022-07-29T07:33:37Z Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium Feng, Jianhang Chua, Song Xing Yang, Fan Qian, Shunzhi School of Civil and Environmental Engineering Engineering::Civil engineering Cracks Repair High strength engineered cementitious composites (ECC) that fracture under tensile stress present cracks with the width over 100 μm, which may not be easily repaired by autogenous healing. Herein, this study investigated the healing efficiency of high strength ECC after being immersed in bacteria-free medium which is waste medium during spore cultivation. During incubation of bacteria, concentration of carbonate ions in the medium could rise to 0.30 mol/L approximately. These carbonate ions can be leveraged in calcium carbonate precipitation process for crack healing, which contributed to greater reduction of crack width of ECC specimens in waste medium than that in water. The superior crack closure led to the recovery of water tightness by lowering down the water absorption of cracked specimens and the restoration of tensile properties including both tensile strength and ultimate strain even after final failure of specimens. Therefore, it can be concluded that bacteria-free waste medium is promising to promote healing of concrete cracks. 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 Academic Research Funding Tier 1 (RG71/20). 2022-07-29T07:33:37Z 2022-07-29T07:33:37Z 2021 Journal Article Feng, J., Chua, S. X., Yang, F. & Qian, S. (2021). Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium. Cement and Concrete Composites, 123, 104203-. https://dx.doi.org/10.1016/j.cemconcomp.2021.104203 0958-9465 https://hdl.handle.net/10356/160669 10.1016/j.cemconcomp.2021.104203 2-s2.0-85111658710 123 104203 en RG71/20 Cement and Concrete Composites © 2021 Elsevier Ltd. All rights reserved. |
| spellingShingle | Engineering::Civil engineering Cracks Repair Feng, Jianhang Chua, Song Xing Yang, Fan Qian, Shunzhi Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium |
| title | Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium |
| title_full | Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium |
| title_fullStr | Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium |
| title_full_unstemmed | Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium |
| title_short | Crack repairing of high strength engineered cementitious composites using bacteria-free waste medium |
| title_sort | crack repairing of high strength engineered cementitious composites using bacteria free waste medium |
| topic | Engineering::Civil engineering Cracks Repair |
| url | https://hdl.handle.net/10356/160669 |
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