Abstract
The gas permeability, compressive strength, and porosity of concretes were investigated at different ages. Different types of concrete mixes were prepared. The test specimens were cured in a fog room for 1, 3, or 7 days and then stored in a controlled environment until the age of testing. The gas permeability of the cover concrete was measured using an over-pressure method, which is suitable for use in the laboratory or on sites. This method allows differences in w/c ratios and curing conditions to be effectively characterized. The relative humidity of the test specimens was measured just before testing, and it was observed that wet concrete specimens had relatively smaller gas permeability values than dried specimens from similar mixes, due to the fact that the presence of moisture in the concrete blocks and reduces the free transport of gases. The results obtained indicate that early-age curing is an important way to decrease the permeability and to improve other durability parameters of concrete.
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References
Figg, J.W. (1973) Methods of measuring the air and water permeability of concrete. Magazine of Concrete Research, 25, No.85, pp. 213–219.
Cather, R., Figg, J.W., Marsden, A.F. and O’Brien, T.P. (1984) Improvements to the Figg method for determining the air permeability of concrete, Magazine of Concrete Research, 36, No. 129, pp. 241–245.
Gräf, H. and Grube, H. (1986) Verfahren zur Prüfung der Durchlässigkeit von Mörtel und Beton gegenüber Gasen und Wasser, Beton, 5, pp. 184–187 and Beton, 6, pp. 222–226.
Schönlin, K.F. (1989) Permeabilität als Kennwort der Dauerhaftigkeit von Beton, Massivbau Baustofftechnologie Karlsruhe, Heft 8, Ph.D. Thesis, Universität Karlsruhe.
Reinhardt, H.-W. and Mijnsbergen, J.P.G. (1989) In-situ measurement of permeability of concrete cover by over pressure, The life of Structures-Physical testing, Butterworths, pp. 243–254.
Dhir, R.K., Hewlett, P.C., and Chan, Y.N. (1989) Near surface characteristics of concrete: intrinsic permeability, Magazine of Concrete Research, 41, No.147, pp. 87–97.
Hong, C.Z. and Parrot, L.J. (1989) Air permeability of cover concrete and the effect of curing, C&CA Services report, British Cement Association Publication C/5 .
Torrent, R.J. (1992) A two chamber vacuum cell for measuring the coefficient of air permeability of the concrete on site, Materials and Structures, 25, pp. 358–365.
Kollek, J.J., (1989) The determination of the permeability of concrete to oxygen by the Cembureau method-a recommendation, Materials and Structures, 22, pp. 225–230.
Parrot, L.J. (1988) Moisture profiles in drying concrete, Advances in Cement Research, 1, No.3, pp. 164–170.
Parrot, L.J. (1991) Factors influencing relative humidity in concrete, Magazine of Concrete Research, 43, No. 154, pp. 45–52.
Saetta, VA., Schrefler, BA, and Vitaliani, R.V. (1992) Analisi dei fenomeni di diffusioni di sostanze aggressive all’interno delle structure di calcestruzzo armato, Studi e Ricerche, 13, pp. 421–444.
Hansen, K.K., Sorption Isotherms, a Catalogue, The Technical University of Denmark, Technical Report 162/86.
Bamforth, P.B. (1987) The relationship between permeability coefficients for concrete obtained using liquid and gas, Magazine of Concrete Research, 39, No. 138, pp. 3–11.
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© 1996 Springer Science+Business Media Dordrecht
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Reinhardt, H.W., Dinku, A. (1996). Effects of Curing on the Gas Permeability of Cover Concrete. In: Jennings, H., Kropp, J., Scrivener, K. (eds) The Modelling of Microstructure and its Potential for Studying Transport Properties and Durability. NATO ASI Series, vol 304. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8646-7_16
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DOI: https://doi.org/10.1007/978-94-015-8646-7_16
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