EXPERIMENTAL STUDY ON REPAIR SYSTEM FOR SALT-DAMAGED REINFORCED CONCRETE (CONDITIONS OF STEEL BARS ON 10 YEARS' OUTDOOR EXPOSURE TEST)

摘要

Two kinds of methods, restoration ofcross-section and surface coating, have been applied torepair the reinforced concrete structures damaged bychloride attack. But, evaluation of these methods andrepair materials have not been established. In addition,study on the effect of initial internal chloride is less thanthat on the effect of airborne salt on marine structures.Therefore, authors investigated the influence of repairmethods and materials on protecting effect againstcorrosion of initial internal chloride attack, by 10 years'outdoor exposure test.The results are summarized as follows:(1) The most effective material for chloride attack ispolymer cement mortar containing corrosion inhibitor onrestoration of cross-section.(2) It is important to decide the region of restoration,to obtain satisfactory protecting effect.(3) Surface coating is effective method to protectionagainst corrosion of initial internal chloride attack. In thiscase, there are little differences in protecting effect between materials.