HALF-CELL POTENTIAL MEASUREMENTS OF CONCRETE STRUCTURES UNDER SEVERE ENVIRONMENTAL CONDITIONS OF CHLORIDE ATTACK

Abstract

This paper presents a practical use of half-cell potential measurements for the rational maintenance of concrete structures under severe environmental conditions of the chloride attack. The measurement values of half-cell potential varies due to measuring conditions, such as temperature, relative humidity and rainfall, as well as macrocell corrosion. Their fluctuations are highly likely to lead to the misinterpretation. However, the current research on an existing PC bridge indicates that the negative potential area on the equipotential contour map is an efficient indicator to locate the high chloride content points and the localized corrosion sites in spite of those fluctuations.