Abstract
A corrosion of reinforcing-bar by salt injury is one the serious issues for concrete because it damages : durability and strength of concrete structure. We re-examined a rest potential method which has been generally, applied for diagnosis of the reinforcing-bar corrosion. We revealed that the rest potential could be influenced by sime properties of covering concrete since the rest potential of the renforcing-bar was normally measured across the covering, and we proposed a new potential correction procedure taking the properties of covering into account. At the same time, we synthesized an anion adsorbent that could absorb excess amount of chlorine ion in concrete whiclcaused the salt injury, releasing nitrite ion which suppressd the reinforcing-bar corrosion. We also developed an inorganic repair material which contained the adsorbent. Based on the effectiveness of the new material for suppressing the reinforcing-bar corrosion, we propose a new repair method named Suppressing Salt Injury method (SSI method).
