EXPERIMENTAL STUDY ON INSPECTION OF CARBONATION-INDUCED CORROSION WITH HALF-CELL POTENTIAL MEASUREMENT

Abstract

There are various standards and proposals to inspect re-bar corrosion in reinforced concrete structures with half-cell potential measurement, however, it is uncertain whether they are applicable to carbonation-induced corrosion. In this study, to make sure of the applicability of half-cell potential measurement to inspect carbonation-induced corrosion, the promoting carbonation test using RC specimens was carried out. The results indicate that carbonation-induced corrosion occurs at more positive potential than standards and proposals based on chloride-induced corrosion and it is possibly caused by the difference of boundary of concrete and re-bar.