DC and AC measurements of the chloride diffusion coefficient through concrete

Author(s): H. Mercado, S. Lorente, X. Bourbon
Paper category: Conference
Book title: Concrete Repair, Rehabilitation and Retrofitting III (ICCRRR)
Editor(s): M.G. Alexander, H.-D. Beushausen, F. Dehn, P. Moyo
Print ISBN: 978-0-415-89952-9
Publisher: Taylor & Francis Group
Pages: 122 – 123
Total Pages: 2
Language: English

The chloride diffusion coefficient is an indicator of durability. Among the various methods existing to measure this coefficient, the ones based on natural diffusion are the most time consuming. In order to reduce the duration of experiments, accelerated methods were developed during the past 15 years, among which the electrically enhanced tests. Yet, although the effective diffusion coefficient is a unique parameter depending only on the ionic species of interest and the material (through its pore network), these diffusion coefficients are hardly compared to each others. This paper is an attempt to compare two different methods of chloride diffusion coefficient determination. The first method is based on the application of the Nernst-Einstein equation for which the conductivity of the saturated sample is measured by impedance spectroscopy for two kinds of concrete (based on type I and type V cements). The second method is a migration test in which the flux of chloride measured upstream allows calculating the diffusion coefficient by means of the Nernst-Planck equation. The diffusion coefficients calculated with the two methods are in good agreement provided the metrology of the experiments is carefully controlled.

Online publication: 2014
Publication Type: abstract_only
Public price (Euros): 0.00