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

Heesup Choi, Masumi Inoue, Risa Sengoku, Hyeonggil Choi
2017 Advanced Materials Letters  
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
more » ... 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.
doi:10.5185/amlett.2017.1635 fatcat:o35is5qhivgqtnmhyasle5dxwm