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

Heesup Choi1*, Masumi Inoue1, Risa Sengoku1, Hyeonggil Choi2

1Department of Civil and Environmental Engineering, Kitami Institute of Technology, Hokkaido, 090-8507, Japan

2Faculty of Environmental Technology, Muroran Institute of Technology, Hokkaido, 090-8585, Japan

Adv. Mater. Lett., 2017, 8 (10), pp 993-998

DOI: 10.5185/amlett.2017.1635

Publication Date (Web): Jul 22, 2017

E-mail: hs-choi@mail.kitami-it.ac.jp

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, CO32- 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 0.1 mm 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. 

Keywords

Freeze-thaw, micro-crack, PVA fiber, CO2 micro-bubble, self-healing, water tightness, strength recovery.

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