Engineering Mechanics

International Conference

Proceedings Vol. 23 (2017)


May 15 – 18, 2017, Svratka, Czech Republic
Editors: Vladimír Fuis

Copyright © 2017 Brno University of Technology, Faculty of Mechanical Engineering, Institute of Solid Mechanics, Mechatronics and Biomechanics, Brno

ISBN 978-80-214-5497-2 (printed)
ISSN 1805-8248 (printed)
ISSN 1805-8256 (electronic)

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Němeček J., Kruis J., Koudelka T.
pages 710 - 713, full text

In many cases, reinforced concrete structures are influenced by penetration of deteriorating salts that cause corrosion of the steel reinforcement. From a micro-structural point of view, concrete is a heterogeneous composite with tortuous pore microstructure with partially or fully saturated pores. Water in pores allows salt ions to be dissolved and transported towards reinforcement. Different mechanisms such as diffusion or convection take place. The ion convection can be caused by electromotive force acting on charged particles and is caused by an electrical potential gradient. This contribution is devoted to modeling of the diffusion-convection problem applied to chloride migration in concrete. The influence of an external electric field is studied and problems of chloride penetration and extraction are solved. It is shown in the paper that the electric field accelerates the chloride migration by multiple times compared to natural diffusion and can be used as an efficient treatment for rehabilitation of reinforced concrete structures affected by chloride attack.

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