WASH-AWAY OF CHLORIDE ATTACHED TO CONCRETE BY SURFACE WATER FLOW

Abstract

The corrosion of steel in concrete structures depends on the chloride ion concentration at the position of steel reinforcement. Therefore, when the corrosion of steel occurs by the chloride supply from the external environment such as the case of wind-conveyed salt, it is considered effective to reduce the chloride ion concentration on the concrete structure surface to delay the onset of steel corrosion. For this purpose wash-away of chloride on concrete surface by the surface water flow by rainfall and so on can be used. In this study two kinds of water effects are examined, i.e., the impact of rain drops and the surface water flow. The influence of those factors on the wash-away of chloride is examined experimentally and the results are summarized for the characteristics and the amount of chloride washed-away. The summary of the test method proposed in this study is given as an appendix.