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Title |
Chloride Penetration Resistance of Ternary Blended Concrete and Discussion for Durability
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Authors |
송하원 ; 이창홍 ; 이근주 ; 김재환 ; 안기용 |
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Keywords |
삼성분계 콘크리트 ; 내구성 ; 염화물 이동 ; 염화물 투수 ; 콘크리트 배합 ternary blended concrete ; durability ; chloride transport ; chloride penetration ; concrete mix |
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Abstract |
Mineral admixtures are used to improve the quality of concrete and to develop sustainability of concrete structures. Supplementary cementitious materials (SCM), such as silica fume (SF), granulated blast furnace slag (GGBS) and pulverized fly ash (PFA), are gradually recognized as useful mineral admixture for producing high performance concrete. The study on ternary blended concrete utilizing mainly three major mineral admixtures is limited and the study on durability and chloride induced corrosion resistance of ternary blended concrete is very few. This study examines the durability characteristics of the ternary blended concrete composed of different amount of the SCM with ordinary Portland concrete and the study experimentally focuses on corrosion resistance evaluation of ternary blended concrete subjected to chloride attack. In this study, 50% replacement ratio of mineral admixture to OPC was used, while series of combination of 20~40% GGBS, 5~15% SF and 10~45% PFA binder were used for chloride corrosion resistance test. This study concerned the durability properties of the ternary blended concrete including the corrosion resistance, chloride binding, chloride transport and acid neutralization capacity. It was found that the ternary blended concrete utilizing the SCM densified the pore structures to lower the rate of chloride transport. Also, increased chloride binding and buffering to acid were observed for the ternary blended concrete with chlorides in cast.
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