Abstract
In order to develop a better understanding of the relationship between 90-day salt ponding test and accelerated chloride migration test (ACMT; the electrochemical technique is applied to accelerate chloride ion migration), the transport properties for concrete obtained from ACMT are compared to the diffusion coefficient from ponding test. The plain cement concrete, fly ash concrete, and slag concrete with different w/b ratios (0.35, 0.45, 0.55, and 0.65) were used. In this study, the total chloride content and penetration depth of concretes were measured after the ponding test, and the Fick's second law of diffusion was fitted to the data from experiment to determine the diffusion coefficient. The non-steady-state diffusion coefficient, the migration coefficient, and the current corresponding to the 30000 coulomb, charge passed obtained from ACMT in the previous works were compared with the diffusion coefficients obtained from ponding test. Parallel tests show that the diffusion coefficients obtained from ponding test correspond well with the non-steady-state diffusion coefficient, the migration coefficient, and the current corresponding to the 30000 coulomb charge passed obtained from ACMT, although the diffusion coefficient measured by ponding test is different from that measured by the ACMT in non-steady state and steady state.
Résumé
Pour mieux comprendre la relation entre l'essai de trempage dans l'eau salée pendant 90 jours et l'essai accéléré de migration de chlorure (ACMT; la technique électro-chimique est employée pour accélérer lamigration des ions chlorure), les propriétés de transport du béton obtenues par l'ACMT sont comparées au coefficient de diffusion de l'essai de trempage. Du ciment simple, des cendres volantes ainsi que des scories avec des rapports eau/liant différents (0.35, 0.45, 0.55 et 0.65) ont été utilisés. Dans cette étude, la teneur totale en chlorure et la profondeur de pénétration des ciments ont été mesurées après l'essai de trempage, et la seconde loi de diffusion de Fick correspond aux données tirées, d'expériences visant à déterminer le coefficient de diffusion. Le coefficient de diffusion de l'état non stationnaire, le coefficient de migration, et le courant de charge passé correspondant à 30000 coulombs obtenu à partir de l'ACMT d'expériences précédentes ont l'eté comparés aves les coefficients obtenus à partir de l'essai de trempage. Des essais parallèles montrent que les coefficients obtenus à partir de l'essai de trempage correspondent bien au coefficient de diffusion de l'état non stationnaire, le coefficient de migration, et le courant de charge passé correspondant à 30000 coulombs après l'ACMT, bien que le coefficient de diffusion mesuré par l'essai de trempage soit différent, dans les états non stationnaire et stationnaire de celui mesuré par l'ACMT.
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Yang, C.C. A comparison of transport properties for concrete using the ponding test and the accelerated chloride migration test. Mat. Struct. 38, 313–320 (2005). https://doi.org/10.1007/BF02479296
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DOI: https://doi.org/10.1007/BF02479296