Effect of Non-Linear Chloride Binding on the Prediction of Chloride Penetration Into Concrete Structures

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Title: Effect of Non-Linear Chloride Binding on the Prediction of Chloride Penetration Into Concrete Structures

Author(s): L. O. Nilsson, M. Massat, and L. Tang

Publication: Special Publication

Volume: 145

Issue:

Appears on pages(s): 469-486

Keywords: binders (materials); chlorides; diffusivity; finite difference theory; penetration tests; Materials Research

Date: 5/1/1994

Abstract:
Fick's second law is usually used to predict the penetration of chloride ions into concrete. The diffusion coefficient depends on the chloride binding properties. Since the chloride binding capacity varies with chloride concentration, the diffusion coefficient is not a constant. This may introduce large errors in predicting the chloride penetration using constant diffusion coefficients experimentally determined at high chloride concentrations. The effects of nonlinear chloride binding and nonconstant diffusion coefficients are calculated with the finite difference method. The effects are shown to be significant on the results of diffusion cell experiments, immersion tests, and predicted chloride penetration. Predicted chloride profiles coincide well with accurate laboratory and field test results.