염해 및 복합열화에 의한 부식촉진시험과 장기폭로 시험의 상관성에 관한 연구

Abstract

Interest in the durability assessment and structural performance has increased according to an increase of concretestructures in salt damage environment recent years. Reliable way ensuring the most accelerated corrosion testis a method of performing the rebar corrosion monitoring as exposed directly to the marine test site exposure. However, long-term exposure test has a disadvantage because of a long period of time. Therefore, many studieson reinforced concrete in salt damage environments have been developed as alternatives to replace this. However,accelerated corrosion test is appropriate to evaluate the critical chlorine concentration in the short term, but onlyaccelerated test method, is not easy to get correct answer. Accuracy of correlation acceleration test depends onthe period of the degree of exposure environments. Therefore, in this study, depending on the concrete mix material,by the test was performed on the basis of the composite degradation of the salt damage, and investigate thedifference of corrosion initiation time of the rebar, and indoor corrosion time of the structure, of the marineenvironment of the actual environments were inuestigated. The correlation coefficient was derived in the experiment. Long-term exposure test was actually conducted in consideration of the exposure conditions submerged zone,splash zone and tidal zone. The accelerated corrosion tests were carried out by immersion conditions, and bythe combined deterioration due to the carbonation and accelerated corrosion due to wet and dry condition.