Abstract
Preventive capabilities of repair methods against salt damages to reinforced concrete structures were studied by comparing three different repair materials. Surface covering and chipping-molding repair were applied and subjected to an accelerated test and outdoor exposure test for 10 years. The preventive capabilities of these methods were compared in terms of the rate of corroded area and the rate of corrosion weight loss of the reinforcing bars. It was proven that the chipping-molding method extending over the backside of reinforcing steel using SBR polymer cement mortar with a corrosion inhibitor was effective while the surface covering method was applicable when the amount of chloride in concrete structures was excessive. The rate of corroded area of reinforcing steel repaired with the chipping-molding method was relevant to parameters such as duration of acceleration, amount of chlorides, type of repair material, use of inhibitor and water-cement ratio of concrete, while that repaired with the surface covering method was relevant to the duration of acceleration, amount of chlorides and use of inhibitor. The rate of corroded area may be predicted with these parameters.
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