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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Estimation of Effective Diffusion Coefficients and Non-Linear Binding Parameters of Chloride by Reverse Analysis of Chloride Profiles
Author(s): K. Yamada, Y. Hosokawa, D. Mori, Y. Yamada, and B. Johannesson
Publication: Special Publication
Appears on pages(s): 39-52
Keywords: chloride; chloride binding; effective diffusion coefficient; EPMA; finite-difference method; numerical calculation; reverse analysis
Abstract:Instead of the conventional method for evaluating an apparent diffusion coefficient of chloride ions (Cl-) from experimental Cl- concentration profile, this study introduces a novel method to estimate an effective diffusion coefficient (De) and non-linear binding parameters (a, b) of Cl- from a Cl- concentration profiles measured by electron probe micro analysis (EPMA). This estimation is made by the combination of numerical analysis by the finite-difference method of the non-linear diffusion equation and optimizing calculations. By using this method, De, a and b are estimated for several kinds of concrete having various type of cement and several levels of water-cement ratio. The estimated values of De show a positive linear relationship with values of De obtained by migration tests. The estimated values of a show a good correlation with the alumina content in cement as expected. These results indicate the validity of this method for estimating parameters required for predicting future Cl- concentration profiles.
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