Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking

Despite the development of several self-healing concrete techniques, only micro cracks can be effectively self-repaired. To achieve self-healing of macro cracks (>1 mm), a strategy by in-situ calcium alginate crosslinking within cracks was proposed herein. This strategy was accomplished by encaps...

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Main Authors: Feng, Jianhang, Yap, Xiu Yun, Gao, Jian, Gan, Chee Lip, Wang, Ruixing, Qian, Shunzhi
Other Authors: School of Civil and Environmental Engineering
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/169029
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1690292023-10-06T06:21:52Z Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking Feng, Jianhang Yap, Xiu Yun Gao, Jian Gan, Chee Lip Wang, Ruixing Qian, Shunzhi School of Civil and Environmental Engineering School of Materials Science and Engineering Temasek Laboratories @ NTU Engineering::Civil engineering Engineering::Materials Calcium Alginate Cementitious Composites Despite the development of several self-healing concrete techniques, only micro cracks can be effectively self-repaired. To achieve self-healing of macro cracks (>1 mm), a strategy by in-situ calcium alginate crosslinking within cracks was proposed herein. This strategy was accomplished by encapsulating sodium alginate in polyethylene glycol granules coated with epoxy resin and calcium sulphoaluminate cement as protective shells. The capsules can release alginates and leach calcium in water once broken and subsequently the gelation can be conducted, thereby generating hydrogels. By incorporating the capsules in mortar specimens, hydrogels were successfully formed through calcium alginate crosslinking after cracking, which led to closures of 1–4 mm wide cracks and significant reduction of water permeability mainly in 1 day. The crack sealing due to crosslinking generation was further simulated by a modified model in terms of hydrogel volume growth and the predicted crack sealing evolutions were 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). 2023-06-27T05:25:54Z 2023-06-27T05:25:54Z 2023 Journal Article Feng, J., Yap, X. Y., Gao, J., Gan, C. L., Wang, R. & Qian, S. (2023). Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking. Cement and Concrete Research, 165, 107074-. https://dx.doi.org/10.1016/j.cemconres.2022.107074 0008-8846 https://hdl.handle.net/10356/169029 10.1016/j.cemconres.2022.107074 2-s2.0-85145657588 165 107074 en RG71/20 Cement and Concrete Research © 2022 Elsevier Ltd. All rights reserved.
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
Engineering::Materials
Calcium Alginate
Cementitious Composites
spellingShingle Engineering::Civil engineering
Engineering::Materials
Calcium Alginate
Cementitious Composites
Feng, Jianhang
Yap, Xiu Yun
Gao, Jian
Gan, Chee Lip
Wang, Ruixing
Qian, Shunzhi
Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking
description Despite the development of several self-healing concrete techniques, only micro cracks can be effectively self-repaired. To achieve self-healing of macro cracks (>1 mm), a strategy by in-situ calcium alginate crosslinking within cracks was proposed herein. This strategy was accomplished by encapsulating sodium alginate in polyethylene glycol granules coated with epoxy resin and calcium sulphoaluminate cement as protective shells. The capsules can release alginates and leach calcium in water once broken and subsequently the gelation can be conducted, thereby generating hydrogels. By incorporating the capsules in mortar specimens, hydrogels were successfully formed through calcium alginate crosslinking after cracking, which led to closures of 1–4 mm wide cracks and significant reduction of water permeability mainly in 1 day. The crack sealing due to crosslinking generation was further simulated by a modified model in terms of hydrogel volume growth and the predicted crack sealing evolutions were consistent with the experimental results.
author2 School of Civil and Environmental Engineering
author_facet School of Civil and Environmental Engineering
Feng, Jianhang
Yap, Xiu Yun
Gao, Jian
Gan, Chee Lip
Wang, Ruixing
Qian, Shunzhi
format Article
author Feng, Jianhang
Yap, Xiu Yun
Gao, Jian
Gan, Chee Lip
Wang, Ruixing
Qian, Shunzhi
author_sort Feng, Jianhang
title Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking
title_short Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking
title_full Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking
title_fullStr Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking
title_full_unstemmed Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking
title_sort rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking
publishDate 2023
url https://hdl.handle.net/10356/169029
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