Experimental Study of the Crack Control of Concrete by Self-healing of Synthetic Fiber Reinforced Cementitious Composites Synthetic Fiber
Keywords:micro crack, PVA, CO2 micro-bubble, self-healing, Ca(OH)2, CaCO3
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 watertightness 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.
C.Edvardsen,“Water permeability and autogenoushealing of cracks in concrete,”ACI Materials Journal, vol. 96, no. 4, pp. 448-454, 1999.
D. Homma, H.Mihashi, and T.Nishiwaki, “Self-healing capability of fiber reinforced cementitiouscomposites,”Journal of Advanced Concrete Technology, vol. 7, no. 2, pp. 217-228, 2009.
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