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Influence of Porosity on the CO2 Diffusion Characteristic in Concrete
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 Title & Authors
Influence of Porosity on the CO2 Diffusion Characteristic in Concrete
Oh, Byung-Hwan; Jung, Sang-Hwa; Lee, Myung-Kue;
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 Abstract
The diffusivity of carbon dioxide in concrete is very important in that it directly affects the degree of carbonation in concrete structures. The purpose of the present study is to explore the diffusivity of carbon dioxide and to derive a realistic equation to estimate the diffusion coefficient of carbon dioxide in concrete. For this purpose, several series of concrete specimens have been tested. Major test variables were the water-cement ratios. The total porosities and the diffusion coefficients of carbon dioxide were measured for the specimens. The present study indicates that the measured porosities agree well with the calculated ones. The effects of porosity and relative humidity on the diffusion coefficient of carbon dioxide were examined. A prediction equation to estimate the diffusion coefficient of carbon dioxide was derived and proposed in this study. The proposed equation shows reasonably good correlation with test data on the diffusion coefficient of concrete
 Keywords
carbonation;relative humidity;porosity; diffusion coefficient equation;
 Language
Korean
 Cited by
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