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Numerical prediction of chloride penetration in concrete under tidal action

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Document pages: 10 pages

Abstract: Reinforced concrete structures have a high risk of steel corrosion when they are exposed to corrosive environment, such as tidal zone, which is a part of marine structures. In this paper, chloride penetration in concrete exposed to tidal zones is predicted using a combined moisture and chloride transport model. In order to analyze water transport, the pore size distribution in concrete is determined according to experimental observations and used to determine water permeability and saturation. Then, the water distribution along the penetration depth is applied to the chloride ion convection and diffusion model to calculate the chloride ion distribution through the unsaturated concrete cover. Evaluate the sensitivity of service life to environmental and concrete mixing conditions this study used three types of tide levels and water to cement ratios in the simulation. Under 10 years of tidal exposure condition, the minimum required cover depth at which the threshold chloride concentration reaches on the steel embedment increases only about 1.13 times as the tide level increases from the minimum to the highest while that for the ratio increases about 1.69 times.

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