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Effect of the Kinds and Replacement Ratios of Mineral Admixtures on the Development of Concrete Resistance against the Penetration of Chloride Ions
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 Title & Authors
Effect of the Kinds and Replacement Ratios of Mineral Admixtures on the Development of Concrete Resistance against the Penetration of Chloride Ions
Kim Young-Jin; Lee Sang-Soo; Kim Dong-Seuk; Yoo Jae-Kang;
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This paper investigates the effect of the concrete containing mineral admixtures(pozzolanic materials such as fly-ash, ground granulated blast-furnace slag, silica fume and meta kaolin) on the resistance properties to chloride ion invasion. The purposed testing procedure was applied to the concrete replaced mineral admixtures for 34 replacement ratios under water-binder ratios ranged from 0.40 to 0.55. For the electro-migration test, Tang and Nilsson's method was used to estimate the diffusion coefficient of chloride ion. As a results, the water-binder ratios, kinds of mineral admixtures and replacement ratios, water curing periods had a great effect on the diffusion coefficient of chloride ion, and the optimal replacement ratios had a limitation for each mineral admixtures. Also, the use of mineral admixtures by mass(replacement of OPC) enhance the resistance ability against chloride penetration compared with the plain concrete. The compressive strength was shown related to the diffusion coefficient of chloride ion, the compressive strength increases with the diffusion coefficient of chloride ion decreasing. Below the 50 MPa, the variation of diffusion coefficient of concrete replaced mineral admixtures was bigger than that of plain concrete.
electro-migration test;diffusion coefficient of chloride ion;mineral admixture;compressive strength;
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