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- W858006736 abstract "This paper is based on the results of an extensive laboratory study, and proposes empirical statistical models which correlate oxygen permeability with several characteristics of concrete. The models were applied to predict adequate levels of performance for concrete in bridge structures. The authors also propose the use of the models to set criteria for designing durable concrete mixes. The mix design used in this investigation was based on the criterion of minimum porosity, which involves selecting the components of concrete to achieve maximal packing. The relevant parts of British Standard BS 1881 were used for some of the measurements, and the concrete samples were cured in a fog room kept at 20 degrees C and 100% relative humidity. The authors conclude that: (1) the parameters affecting the oxygen permeability of concrete are: (a) air content; (b) water/cement ratio; (c) porosity; (d) age; (2) oxygen permeability is related to the porosity/strength ratio, and this relationship is influenced by the presence of pfa (pulverised fly ash) in the concrete; (3) oxygen permeability, porosity, and strength influence concrete's performance in a specific environment, and at least two of these three parameters are needed to predict concrete performance; and (4) a suitable one-day target value for oxygen permeability for design is 10 (super-16) square m. For the covering abstract of the conference see IRRD 858334. The French title of this paper is:- Porosite et permeabilite comme indicateur de comportement du beton. The German title of this paper is:- Porositaet und Durchlaessigkeit als Indikatoren des Betonverhaltens." @default.
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- W858006736 date "1989-01-01" @default.
- W858006736 modified "2023-09-23" @default.
- W858006736 title "POROSITY AND PERMEABILITY AS INDICATORS OF CONCRETE PERFORMANCE" @default.
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