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Title |
A Study on Long-Term Mechanical Properties and Durability in Metakaolin Concrete Bridge Deck
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Authors |
양은익 ; 김명유 ; 양주경 ; 박해균 ; 최윤석 |
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Keywords |
메타카올린 콘크리트 ; 교량바닥판 ; 내구성 ; 역학적 특성 ; 양생재령 ; Metakaolin concrete ; Bridge deck ; Durability ; Mechanical properties ; Curing age |
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Abstract |
The requirement for durability of concrete bridge deck is increasing as the deterioration for the concrete bridge deck exposed to severe environment has been increased. For this reason, the concern about high-durable concrete is being high. Recently, a metakaolin is highly spotlighted as new admixture because its strength and durability are equivalent to silica fume. On the other hands, there are few researches for the metakaolin concrete bridge deck in domestic. So many various long-term data on the mechanical property and durability is needed to apply metakaolin concrete at the concrete bridge deck construction field. This study is aim to evaluate the long-term mechanical properties and durability of metakaolin concrete bridge deck with curing age. Mechanical properties are estimated by the compressive and flexural strength, and the drying shrinkage, the chloride resistance, the scaling, and freezing and thawing characteristics are compared with curing age. According to the results, when the metakaolin concrete is used, the development of compressive and flexural strength proceed in both the early and old ages. It is also improved the resistance of chloride penetration, freezing and thawing in concrete. It was showed that replacement of metakaolin was efficient for the reduction of the drying shrinkage.
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