A model describing water and salt migration in concrete during wetting/drying cycles

T. Arends, A. Taher, A.J.J. van der Zanden, H.J.H. Brouwers

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Abstract

In order to predict the life span of concrete structures, models describing the migration of chloride are needed. In this paper, a start is made with a simple, theoretical model describing water and chloride transport in a concrete sample. First, transport of water in concrete is considered with Fick’s second law of diffusion, which describes the time-evolution of the water content. Chloride can be transported through concrete by advection with water and by diffusion due to a difference in the chloride concentration of the pore solution. Furthermore, chloride can be bound to the surface of the pore walls. This bound chloride is immobile, thus unavailable for transport. The result is a partial differential equation for the time-evolution of the chloride concentration, coupled to the partial differential equation for water transport. This partial differential equation is solved using the Crank-Nicolson implicit method for a situation in which chloride enters, and in a certain extent also leaves the sample. Because the goal is to describe the migration behavior in the sample during wetting and drying cycles, the sample gets wet during one half of a day and dries during the other half.
Original languageEnglish
Title of host publicationProceedings of the 5th International Conference on Non-Traditional Cement and Concrete (NTCC2014), June 16-19 2014, Brno
EditorsV. Bilek, Z. Kersner
Place of PublicationBrno
PublisherNOVPRESS
Pages5-8
ISBN (Print)9788021448674
Publication statusPublished - 2014
Event5th International Conference on Non-Traditional Cement and Concrete (NTCC2014), 16-19 June 2014, Brno, Czech Republic - Brno, Czech Republic
Duration: 16 Jun 201419 Jun 2014
http://www.fce.vutbr.cz/stm/fracture/symposium2014/

Publication series

NameIJRET : International Journal of Research in Engineering and technology
ISSN (Print)2321-7308

Conference

Conference5th International Conference on Non-Traditional Cement and Concrete (NTCC2014), 16-19 June 2014, Brno, Czech Republic
Abbreviated titleNTCC 2014
CountryCzech Republic
CityBrno
Period16/06/1419/06/14
OtherNon-Traditional Cement & Concrete V (NTCC 2014)
Internet address

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  • Cite this

    Arends, T., Taher, A., van der Zanden, A. J. J., & Brouwers, H. J. H. (2014). A model describing water and salt migration in concrete during wetting/drying cycles. In V. Bilek, & Z. Kersner (Eds.), Proceedings of the 5th International Conference on Non-Traditional Cement and Concrete (NTCC2014), June 16-19 2014, Brno (pp. 5-8). (IJRET : International Journal of Research in Engineering and technology). NOVPRESS.