In this study, it is possible to disperse effectively cracked using synthetic fiber, an examination of the most suitable selfhealing conditions was performed on the above crack width 0.1mm. As a result, effective crack dispersion using polyvinyl alcohol (PVA) fibers with polar OHgroups, as well as improved self-healing for cracks that are larger than 0.1 mm in width, posing concerns of CO2 gas and Clpenetration, were observed. Also, CO3 2reacts with Ca 2+ in the concrete crack, resulting in the

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... 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.