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Strength recovery of concrete exposed to freezing-thawing by self-healing of cementitious materials using synthetic fiber

By CHOI Heesup, INOUE Masumi, SENGOKU Risa and CHANG Young-Cheol

Abstract

In this study, it is possible to disperse effectively cracked using synthetic fiber, an examination of the most suitable self-healing conditions was performed on the above crack width 0.1mm. As a result, effective crack dispersion using polyvinyl alcohol(PVA) fibers with polar OH-groups, as well as improved self-healing for cracks that are larger than 0.1 mm in width, posing concerns of CO2 gas and Cl-penetration, were observed. Also, CO3 2-reacts with Ca2+ in the concrete crack, resulting in the precipitation of a carbonate compound, CaCO3. Based on this, it is deemed possible for the recovery of effective water tightness and strength recovery through effective freezing-thawing resistance to be made from cracks that are larger than 0.1mm in width. In addition, it was determined that, as for the most suitable self-healing conditions in the inside and surface of the cracks, calcium hydroxide (Ca(OH)2) solution with CO2 micro-bubble was more effective in promoting the self-healing capability than water with CO2 micro-bubble. Copyright © 2017 VBRI Press

Topics: Freeze-thaw, micro-crack, PVA fiber, CO2 micro-bubble, self-healing, water tightness, strength recovery, 570
Publisher: 'VBRI Press AB'
Year: 2017
DOI identifier: 10.5185/amlett.2017.1635
OAI identifier: oai:muroran-it.repo.nii.ac.jp:00009552
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