Experimental and numerical study of electrochemical chloride removal from brick and concrete specimens

The electrochemical technique for chloride extraction (desalination) was applied in galvanostatic mode to cylindrical brick and concrete specimens with a steel bar as reinforcement placed in the centre. The specimens were initially contaminated by immersion in a solution of 35 g/l NaCl. Based on the...

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Bibliographic Details
Published in:Cement and concrete research 2007, Vol.37 (1), p.54-62
Main Authors: Toumi, A., François, R., Alvarado, O.
Format: Article
Language:English
Subjects:
Brick
Chloride(D)
Civil Engineering
Concrete(E)
Diffusion(C)
Engineering Sciences
Migration
Modelling
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Summary:The electrochemical technique for chloride extraction (desalination) was applied in galvanostatic mode to cylindrical brick and concrete specimens with a steel bar as reinforcement placed in the centre. The specimens were initially contaminated by immersion in a solution of 35 g/l NaCl. Based on the Nernst–Planck equations, a numerical model was developed considering the interactions between the various ionic species in the pore solution. The model makes it possible to predict the evolution of the chloride profile with time. The numerical and experimental results are compared and the model parameters discussed.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2006.09.012