A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Organic coatings for concrete protection: liquid water and water vapour permeabilities
Concrete is porous and deterioration in reinforced concrete structures mainly results from substances penetrating the concrete. Therefore, one of the main functions of a protective surface coating is to inhibit water penetration. Having a high water vapour permeability is another basic task since it is impossible to stop the access to water. Our investigation deals with liquid water and water vapour permeability of some concrete coatings. Because test methods and standards for characterising concrete coatings are areas needing further research, two new methods for liquid water and water vapour permeability evaluation were set up. Liquid water permeability was measured by an easily realizable test which allows a sensible distinction between very similar systems which have low water permeabilities. Water vapour transmission of the different coatings was deduced by the analysis of the measured rate of weight loss. The diffusion resistance coefficients for H2O vapour in concrete are in good agreement with the values presented in other works. It must be noted that, even if the results have been obtained in quite drastic conditions, they certainly give effective quantitative information about the characteristics of the coatings, the behaviour of which we wish to evaluate. The results obtained following the theoretical approaches presented are in agreement with those observable through the qualitative analysis of the experimental diagrams. Thus, the coefficients obtained give a valid evaluation of coating properties even if they are based on a non-standard optimizabel model.
Organic coatings for concrete protection: liquid water and water vapour permeabilities
Concrete is porous and deterioration in reinforced concrete structures mainly results from substances penetrating the concrete. Therefore, one of the main functions of a protective surface coating is to inhibit water penetration. Having a high water vapour permeability is another basic task since it is impossible to stop the access to water. Our investigation deals with liquid water and water vapour permeability of some concrete coatings. Because test methods and standards for characterising concrete coatings are areas needing further research, two new methods for liquid water and water vapour permeability evaluation were set up. Liquid water permeability was measured by an easily realizable test which allows a sensible distinction between very similar systems which have low water permeabilities. Water vapour transmission of the different coatings was deduced by the analysis of the measured rate of weight loss. The diffusion resistance coefficients for H2O vapour in concrete are in good agreement with the values presented in other works. It must be noted that, even if the results have been obtained in quite drastic conditions, they certainly give effective quantitative information about the characteristics of the coatings, the behaviour of which we wish to evaluate. The results obtained following the theoretical approaches presented are in agreement with those observable through the qualitative analysis of the experimental diagrams. Thus, the coefficients obtained give a valid evaluation of coating properties even if they are based on a non-standard optimizabel model.
Organic coatings for concrete protection: liquid water and water vapour permeabilities
Organische Beschichtungen für den Schutz von Beton
Barbucci, A. (author) / Delucchi, M. (author) / Cerisola, G. (author)
Progress in Organic Coatings. An International Journal ; 30 ; 293-297
1997
5 Seiten, 4 Bilder, 3 Tabellen, 13 Quellen
Article (Journal)
English
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