Browse > Article
http://dx.doi.org/10.4334/JKCI.2003.15.3.443

Influence of Porosity on the CO2 Diffusion Characteristic in Concrete  

Oh, Byung-Hwan (Dept. of Civil Engneering, Seoul National University)
Jung, Sang-Hwa (Dept. of Civil Engneering, Jeonju University)
Lee, Myung-Kue (Dept. of Civil Engneering, Jeonju University)
Publication Information
Journal of the Korea Concrete Institute / v.15, no.3, 2003 , pp. 443-453 More about this Journal
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 $CO_2$ diffusion coefficient of concrete
Keywords
carbonation; relative humidity; porosity; $CO_2$ diffusion coefficient equation;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Stephen Brunauer, L. E. Copeland, 'The chemistryof concrete,' Scientific American, Vo1.210, No.4,1964, pp.80-92   DOI
2 H. F. W. Taylor, 'Cement chemistry,' Academic Press, London, 1990, pp.123-152
3 N. I. Fattuhi, 'Concrete carbonation as influenced by curing regime,' Cement and Concrete Research, Vol.18, No.3, 1988, pp.426-430   DOI   ScienceOn
4 오병환, 이명규, 정상화, '콘코리트의 기체확산계수측정장치 개발 및 응용', 대한토목학회 논문집, 제23권 제 1A호, 2003. 1, pp.77-84
5 V. G. Papadakis, C. G. Vayenas, and M N. Fardis, 'Physical and chemical charactehstics affecdng the durability of concrete,' ACI Material Journal, March-April,88-M24, 1991, pp.186-196
6 V. G. Papadakis, C. G. Vayenas, and M N. Fardis, 'A reaction engineering approach to the problem of concrete carbonation,' AIChE Journal, October, Vol. 35, No. 10, 1989, pp.1639-1650   DOI
7 I. Soroka, 'Portland cement paste and concrete,'Chemical Publishing Co., Haifa, 1980, pp.30-39
8 R L Day and B. K. Marsh, 'Measurement of porosity in blended cement pastes,' Cement and Concrete Research, Vol. 18, No. 1, 1988, pp.63-73   DOI   ScienceOn
9 'Standard practice for maintaining constant relative humidity by means of aqueous solution,' ASTM E104-85, 1996
10 Y. F. Houst and F. H. Wittmann, 'Influence of porosity and water content on the diffusivity of CO2 and O2 through hydrated cement paste,' Cement and Concrete Research Vol. 24, No. 6, 1994, DD.1165-1176   DOI   ScienceOn
11 M. D. A Thomas and J. D. Matthews, 'Carbonation of fly ash conocrete,' Magazine of Concrete Research, Vol. 44, No. 160, September, 1992, PP.217- 228   DOI
12 N. I. Fattuhi, 'Carbonation of concrete as affected by mix constituents and initial water curing priod,'Materials and Structures, Vo1.19, No.110, February, 1986, pp.131-136   DOI