Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Effectiveness of surface coatings to protect reinforced concrete in marine environments
Abstract Coatings can contribute to extending service life of concrete structures exposed to marine environents by reducing the rate of chloride penetration. In the present paper, the effect of coatings on the rate of chloride uptake was studied by measuring their concentration profiles at different, times, extending up to 24 months. Using a solution of the so-called Fick’s second law of diffusion, least-square fitting leads to the value of chloride concentration under the coating (Co) which allowed us to compare the effectiveness of different coatings. Dependeng on the formulation, some of the studied acrylic coatings could reduce the value ofCo by more than 80% in comparison to the unpainted concrete. Water permeability coefficients were measured for the same coatings, according to EN 1062-3. The ranking of effectiveness to stop chlorides is the same as the water imperviousness, but the minimum requrement proposed by prEN 1504-2 (0.1 kg.$ m^{−2} $$ h^{−0.5} $) did not prove to be enough for an efficient protection against chloride permeation.
Effectiveness of surface coatings to protect reinforced concrete in marine environments
Abstract Coatings can contribute to extending service life of concrete structures exposed to marine environents by reducing the rate of chloride penetration. In the present paper, the effect of coatings on the rate of chloride uptake was studied by measuring their concentration profiles at different, times, extending up to 24 months. Using a solution of the so-called Fick’s second law of diffusion, least-square fitting leads to the value of chloride concentration under the coating (Co) which allowed us to compare the effectiveness of different coatings. Dependeng on the formulation, some of the studied acrylic coatings could reduce the value ofCo by more than 80% in comparison to the unpainted concrete. Water permeability coefficients were measured for the same coatings, according to EN 1062-3. The ranking of effectiveness to stop chlorides is the same as the water imperviousness, but the minimum requrement proposed by prEN 1504-2 (0.1 kg.$ m^{−2} $$ h^{−0.5} $) did not prove to be enough for an efficient protection against chloride permeation.
Effectiveness of surface coatings to protect reinforced concrete in marine environments
Rodrigues, M. P. M. C. (Autor:in) / Costa, M. R. N. (Autor:in) / Mendes, A. M. (Autor:in) / Eusébio Marques, M. I. (Autor:in)
2000
Aufsatz (Zeitschrift)
Englisch
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