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A semi-closed-form solution for chloride diffusion in concrete with time-varying parameters

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posted on 2024-07-12, 14:51 authored by T. Maheswaran, Jay SanjayanJay Sanjayan
Reinforcement corrosion in concrete is a worldwide problem and billons of dollars are spent each year on repair and replacement of reinforced concrete structures because of corrosion damage of reinforcement. Chloride induced corrosion is the major type of corrosion encountered in reinforced concrete. The corrosion is initiated in reinforcement when chloride diffuses through the concrete cover and the chloride concentration at the reinforcement reaches a critical threshold level. Pick's second law of diffusion is commonly used for one-dimensional chloride diffusion. A closed-form solution based on error function is commonly used to predict the chloride concentrations, if the diffusion coefficient (D) and surface chloride concentration (Cs) remain constant. This solution is not applicable when D and Cs vary with time, which is the case in real-life situations. The finite difference or finite element methods with specialised software are generally used to solve such problems. This paper reviews existing methods and presents an alternative method based on a general closed-form solution with varying D but constant Cs. To incorporate the effect of varying Cs, an adaptation of the closed-form solution is presented. This solution can be used without the use of finite difference method or special computer software to predict the chloride concentrations.

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ISSN

0024-9831

Journal title

Magazine of Concrete Research

Volume

56

Issue

6

Pagination

7 pp

Publisher

ICE Publishing

Copyright statement

Copyright © 2004 Thomas Telford Ltd. This paper was originally published in the Magazine of Concrete Research and is available from: http://www.concrete-research.com. The published version is reproduced with the permission of the publisher.

Language

eng

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