EXPERIMENTAL RESEARCH ON CORROSION PROTECTION PERFORMANCE OF MORTAR COVERING METHODS USING CONDUCTIVITY MORTAR FOR MARINE STEEL STRUCTURES

Abstract

 To corrosion protection in marine steel structures, cathodic protection methods is applied to the under-seawater area, and coating protection methods is applied above the tidal zone. Therefore, we considered to expand the effective range of cathodic protection in under-seawater to the coating protection area by apply high-conductivity mortar mixed with carbon as a coating material. Compared to ordinary concrete, it can reduce the resistance to 1/100 and confirmed that it can be protected with 0.1 µA/cm² corrosion protection current in underwater environment and 20 µA/cm² in dry environment. At the time of two years of exposure, sufficient anticorrosion performance was confirmed at a depth of L.W.L+160 cm or less.