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Abstract

In this study, the improved Japanese salt sampler was adopted for the air-borne salt sampling tests in coastal areas of northern Taiwan. Thirty-five collection stations were set up in the northern coastal areas to collect air-borne salt data monthly from 2006 to 2009. As the exposure of structures in the natural environment, the chloride on the concrete surface of RC structures would be washed away by the precipitation. Therefore, a two-phase collection method was used to get the total air-borne salt “Cair” and the adhesive air-borne salt “Cadh”. The statistic results showed that the percentage of Cadh/Cair has a high correlation with the volume of effective precipitation. Conclusively, the concentration of chloride ion on the concrete surface can be inferred a linear empirical formula according to the regional climatic characters to indicate the total air-borne salt and the adhesive air-borne salt on concrete surface respectively.

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