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A Study on Resistance of Chloride Ion Penetration in Ground Granulated Blast-Furnace Slag Concrete
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 Title & Authors
A Study on Resistance of Chloride Ion Penetration in Ground Granulated Blast-Furnace Slag Concrete
Song, Ha-Won; Kwon, Seung-Jun; Lee, Suk-Won; Byun, Keun-Joo;
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Chloride ion inside concrete destroys the so-called passive film surrounding reinforcing bars inside concrete so that the so-called salt attack accelerates corrosion which is the most critical factor for durability as well as structural safety of reinforced concrete structures. Recently, as a solution of the salt attack, the ground granulated blast-furnace slag(GGBFS) have been used as binder or blended cement more extensively. In this paper, characteristics of chloride ion diffusion for the GGBFS concrete, which is known to possess better resistance to damage due to the chloride ion penetration than ordinary portland cement(OPC) concrete possesses, are analyzed and a chloride ion diffusion model for the GGBFS concrete is proposed by modifying an existing diffusion model for the OPC concrete. The proposed model is verified by comparing diffusion analysis results using the model accelerated chloride penetration test results for concrete specimens as well as field test results for an RC bridge pier. Then, an optimal resistance condition to chloride penetration for the GGBFS concrete is obtained according to degrees of fineness and replacement ratios of the GGBFS concrete. The result shows that the GGBFS concrete has better resistance to chloride ion penetration than OPC concrete has and the resistance is more affected by the replacement ratio than the degree of fineness of the GGBFS.
ground granulated blast-furnace slag(GGBFS);chloride ion;diffusion model;accelerated chloride penetration test;
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