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Effective Crack Control of Concrete by Self-Healing of Cementitious Composites Using Synthetic Fiber

1
Department of Civil and Environmental Engineering, Kitami Institute of Technology, Hokkaido 090-8507, Japan
2
Public Housing Division, Korea Land & Housing Institute, Daejeon 34047, Korea
3
Faculty of Environmental Technology, Muroran Institute of Technology, Hokkaido 090-8585, Japan
4
Department of Architectural Engineering, Songwon University, Gwangju 61756, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Prabir K. Sarker
Materials 2016, 9(4), 248; https://doi.org/10.3390/ma9040248
Received: 2 March 2016 / Revised: 14 March 2016 / Accepted: 24 March 2016 / Published: 30 March 2016
Although concrete is one of the most widely used construction materials, it is characterized by substantially low tensile strength in comparison to its compression strength, and the occurrence of cracks is unavoidable. In addition, cracks progress due to environmental conditions including damage by freezing, neutralization, and salt, etc. Moreover, detrimental damage can occur in concrete structures due to the permeation of deteriorating elements such as Cl and CO2. Meanwhile, under an environment in which moisture is being supplied and if the width of the crack is small, a phenomenon of self-healing, in which a portion of the crack is filled in due to the rehydration of the cement particles and precipitation of CaCO3, is been confirmed. In this study, cracks in cementitious composite materials are effectively dispersed using synthetic fibers, and for cracks with a width of more than 0.1 mm, a review of the optimal self-healing conditions is conducted along with the review of a diverse range of self-healing performance factors. As a result, it was confirmed that the effective restoration of watertightness through the production of the majority of self-healing products was achieved by CaCO3 and the use of synthetic fibers with polarity, along with the effect of inducing a multiple number of hairline cracks. In addition, it was confirmed that the self-healing conditions of saturated Ca(OH)2 solution, which supplied CO2 micro-bubbles, displayed the most effective self-healing performance in the surface and internal sections of the cracks. View Full-Text
Keywords: micro-crack; synthetic fiber; PVA; cementitious composite materials; CO2micro-bubble; self-healing; Ca(OH)2; CO32−; CaCO3 micro-crack; synthetic fiber; PVA; cementitious composite materials; CO2micro-bubble; self-healing; Ca(OH)2; CO32−; CaCO3
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Choi, H.; Inoue, M.; Kwon, S.; Choi, H.; Lim, M. Effective Crack Control of Concrete by Self-Healing of Cementitious Composites Using Synthetic Fiber. Materials 2016, 9, 248.

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