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Influence of Relative humidity on the CO2 Diffusion Coefficient in Concrete
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Influence of Relative humidity on the CO2 Diffusion Coefficient in Concrete
Oh, Byung-Hwan; Jung, Sang-Hwa; Lee, Myung-Kun;
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The carbonation of concrete is one of the major factors that cause durability problems in concrete structures. The rate of carbonation depends largely upon the diffusivity of carbon dioxide in concrete. The purpose of this study is to identify the diffusion coefficients of carbon dioxide for various concrete mixtures. To this end, several series of tests have been planned and conducted. The test results indicate that the diffusion of carbon dioxide reached the steady-state within about five hours after exposure. The diffusion coefficient increases with the increase of water-cement ratio and decreases with the increase of relative humidity at the same water-cement ratio. The content of aggregates also influences the diffusivity of carbon dioxide in concrete. It was found that the diffusion coefficient of cement paste is larger than that of concrete or mortar. The experimental study of carbon dioxide diffusivity in this study will allow more realistic assessment of carbonation depth in concrete structures.
carbonation;gas diffusivity measuring system; diffusion coefficient;relative humidity;
 Cited by
탄산화에 노출된 콘크리트 구조물의 배합설계에 대한 연구 - 유전자 알고리즘 적용성 평가,이성칠;;권성준;

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