A Study on the Electrochemical Properties of Stainless Rebar Used in Patching for Chloride-Induced Corrosion of RC Member
Koichi KOBAYASHI
Abstract:This study aims at clarifying the electrochemical compatibility between carbon steel in chloride-contaminated base concrete and stainless steel in repair concrete. For this purpose, patch repair to RC members deteriorated by chloride-induced corrosion of rebar was simulated. The results can be summarized as follows; The half-cell potential of stainless steel is less affected than that of carbon steel by chloride in concrete. In the repaired specimens, the type of steel used in repair does not affect the relationship between the chloride content and potential or polarization of carbon steel in a base RC member. Anodic polarization curve of stainless steel differs from that of carbon steel, especially in the positive potential range, which, however, can be ignored in actual applications in concrete. Therefore, the use of stainless steel does not accelerate re-deterioration of RC member by electrochemical incompatibility, and is effective for the repair of RC member deteriorated by chloride-induced corrosion. Key Words:Stainless steel, Patch repair, Half-cell potential, Electrochemical incompatibility