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Title: A novel capsule by poly (ethylene glycol) granulation for self-healing concrete
Authors: Feng, Jianhang
Dong, Hua
Wang, Ruixing
Su, Yilin
Keywords: Engineering::Civil engineering
Issue Date: 2020
Source: Feng, J., Dong, H., Wang, R. & Su, Y. (2020). A novel capsule by poly (ethylene glycol) granulation for self-healing concrete. Cement and Concrete Research, 133, 106053-.
Journal: Cement and Concrete Research
Abstract: Minerals can be incorporated in concrete to promote self-healing. Encapsulation of minerals is needed for avoiding undesired reactions before concrete cracks. Therefore, this study designed a novel capsule. The core materials of the capsules were either cement or a combination of cement and superabsorbent polymers (SAPs), which were granulated by poly (ethylene glycol) followed by a waterproof layer (i.e., epoxy resin and sand). The structure and hydration process of capsules, self-healing efficiency of cracked mortars and healing product were characterized. Results showed that core materials in capsules could react with water with dissolution of PEG and swelling of SAP swelled in cracks. Moreover, specimens incorporated capsules showed high sealing ratio for cracks below 400 μm and even inside cracks wider than 200 μm could be bridged due to capsules with SAP. Recovery of water tightness, flexural and compressive strength were obtained. The healing products were C-S-H and CaCO₃.
ISSN: 0008-8846
DOI: 10.1016/j.cemconres.2020.106053
Rights: © 2020 Published by Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:CEE Journal Articles

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