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Chloride-binding isotherms from the diffusion cell test

Authors
Journal
Cement and Concrete Research
0008-8846
Publisher
Elsevier
Publication Date
Volume
28
Issue
7
Identifiers
DOI: 10.1016/s0008-8846(98)00071-4

Abstract

Abstract Improved models of chloride ingress into concrete separate the effects of chloride binding and diffusion. The steady state diffusion coefficient (free from the effects of binding) is often determined in a diffusion cell experiment. This work examines a method of obtaining chloride binding data from the same experiment. This involves the measurement of the total chloride profile in the specimen under investigation, combined with an estimation of the corresponding free chloride concentration, by assuming that the concentration gradient is linear under steady state conditions. Preliminary results suggest that the chloride binding data obtained are typical of those obtained by other methods. One potential advantage of this method is that it is capable of delivering results on relatively large concrete specimens of low free water/cement ratio. However, depth-dependent variations in the properties of the test specimen should be avoided.

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