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Realistic prediction for diffusion coefficient of carbon dioxide in concrete structures

Author(s): S. H. Jung, M. K. Lee, B. H. Oh
Paper category: Proceedings
Book title: Proceedings of the Seventh International Conference on Concrete under Severe Conditions – Environment and Loading
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjřrv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 563-575
Total Pages: 13
Language : English

Abstract: Carbonation of concrete is the most frequent cause of degradation in concrete structures that may cause the acceleration of corrosion of steel bars in concrete. The diffusivity of carbon dioxide in concrete is very important in that it affects directly the degree of carbonation in concrete structures. Therefore, it is necessary to determine correctly the diffusivity of carbon dioxide in concrete materials in order to evaluate realistically carbonation degradation of concrete structures. The purpose of the present study is to explore the characteristics of the diffusivity of carbon dioxide and to derive a realistic equation to estimate the diffusion coefficient of carbon dioxide in concrete. Several series of concrete specimens with various water-cement ratios were tested and the corresponding total porosities and diffusion coefficients of carbon dioxide were measured. The measured porosities are in good agreement with the calculated porosities. The effects of porosity, relative humidity, and aggregate-cement ratio on the diffusion coefficient of carbon dioxide were considered in deriving the proposed diffusivity equation. The proposed equation shows reasonably good correlation with the test data on the diffusion coefficient of carbon dioxide of concrete. The present study provides an efficient basis for more realistic durability assessment and design of concrete structures.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00

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