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Title: Rapid self-sealing of macro cracks of cementitious composites by in-situ alginate crosslinking
Authors: Feng, Jianhang
Yap, Xiu Yun
Gao, Jian
Gan, Chee Lip
Wang, Ruixing
Qian, Shunzhi
Keywords: Engineering::Civil engineering
Issue Date: 2023
Source: 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-.
Project: RG71/20 
Journal: Cement and Concrete Research
Abstract: 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.
ISSN: 0008-8846
DOI: 10.1016/j.cemconres.2022.107074
Schools: School of Civil and Environmental Engineering 
School of Materials Science and Engineering 
Research Centres: Temasek Laboratories @ NTU 
Rights: © 2022 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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