Chloride attack, one of the reasons for early deterioration of concrete, is a phenomenon where detrimental ions such as chlorine ion penetrate into concrete from outside to diffuse and corrode the steel rebar, greatly deteriorating the durability of RC members or structures. Sources of chloride attack can be divided into the direct / indirect influence caused by seawater or its splash in the maritime environment and the de-icing salts used for the purpose of thawing the ice on the wintry road. Most notably, the usage of de-icing salts is essential for the safety of drivers and smooth traffic flows in expressways. However, they also quicken the deterioration of concretes, necessitating the countermeasures for the problem.
This paper discusses the early deterioration and measurements of RC Structures under de-icing salts environments.

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