Determination of Required Cover Depth of Concrete Exposed to Simultaneous Attack of Carbonation and Chloride Ion

중성화와 염소이온의 동시 복합환경에 노출된 콘크리트의 적정 피복두께의 결정

The most common deteriorating processes of concrete structures in the world-wide are carbonation and chloride ion. In this paper, chloride profiles of carbonated concrete is predicted to considering two layer composite model, which is based on Fick's 2nd law. From the experimental result on combined deterioration of chloride and carbonation, it was examined that high chloride concentration was built up to 3-5㎜ over depth from carbonation depth. The analytical modeling of chloride diffusion, which was based on the Fick's 2nd law of diffusion, was suggested to depict the relative influence of the carbonation depth.