Abstract
The salt attack on RC structure causes cracking and spalling of cover concrete due to the corrosion of embedded steel bars. The main purpose of this study is to evaluate the corrosion preventive effectiveness of the existing repairing method composed of coating of steel, patching by mortar materials and surface coating of concrete. The conclusions obtained from this study are as follows (1) Coating of steel does not have a significant corrosion preventive effectiveness in the repairing method. (2) The corrosion preventive effectiveness of the two concrete repairing materials used in this study is almost same. (3) The corrosion preventive effectiveness of the surface coating of concrete depends on cracks between concrete and patching mortar, that is, the effectiveness becomes greater with the cracks. (4) Moisture and chloride contents in concrete are significant factors which affect the corrosion preventive effectiveness of repairing.
