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Title |
Effect of Fluorine-Silicate Hybrid Based Crack Reducing Agent on the Resistance for Shrinkage Crack and Gas Permeability of Concrete
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Authors |
이만익 ; 박종화 ; 남재현 ; 김도수 ; 김재온 |
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Keywords |
불소-실리카 복합형 균열저감제 ; 건조수축 ; 수축균열 ; 투기성 |
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Abstract |
In this study, fundamental properties such as fresh and hardened performance of concrete mix(specification : 25-24-18) added fluorine-silicate hybrid based crack reducing agent(FS) were measured. Addition of FS ranged from 0.5% to 2.0% at intervals 0.5% based on cement weight. Adequate dosage(0.5%) of FS derived from basic properties measurements applied and compared resistance for shrinkage crack. The permeability of concrete in the absence(24-S-0.0) and presence(24-S-0.5) of evaluated at a mock-up sized concrete. Concrete added FS improved resistance for shrinkage crack and consequently crack number, length and area decreased to 50~74.4% compared non-added. As well, by the addition of FS, the resistance for permeability and penetration depth to concrete surface region increased 67% and 40%, respectively. Therefore it was confirmed that shrinkage crack resistance and permeability of concrete could be improved by the addition of FS.
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