Współczynniki dyfuzji i migracji chlorków w betonach z cementami CEM I 42,5 R; CEMII/B-V 32,5 R; CEM I 42,5N/SR3/NA wyznaczone metodami normowymi oraz wg termodynamicznego modelu migracji

This article describes how diffusion coefficients of chlorides were determined in ordinary concretes using three different types of commonly used cement: CEM I 42.5 R, CEM II/B-V 32.5 R and CEM I 42.5 N/SR3/ NA according to applicable standards NT BUILD 443, AASHTO T 259, ASTM C 1556-03. Determined values were compared with values obtained from short migration tests on these concretes using the thermodynamic migration model with the inverse equation for chloride migration in concrete. Additionally, migration coefficients of chloride ions were determined according to the standard NT BUILD 492 and applying a method proposed by Andrade. This comparison of obtained values of diffusion and migration coefficients was used to evaluate the suitability of valid standard methods and their reference to the method of determining diffusion coefficient according the thermodynamic model of migration.