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Interaction between sea water and the surface of concrete – experiences from Norway

Klaartje de Weerdt 1 Marie Salgues 2
1 NTNU - Norwegian University of Science and Technology [Trondheim]
2 C2MA - Centre des Matériaux des Mines d'Alès
Abstract : Sea water leads to a zoned phase changes at the surface of concrete. The surface is often covered with a crust consisting of brucite and calcite. Followed by a leached zone poor in chlorine, sulphur, and calcium where one potentially can find M-S-H. In the following zone one can find sulphur enrichment and the chlorine and calcium content starts to increases. Deeper in the chlorine content reaches a maximum and then gradually decreases again moving even deeper into the concrete. These changes in the phase assemblage at a sea water exposed concrete surface seem to be independent of the tested cement compositions (up to 30-50 % replacement with fly ash or slag). Whether this also indicates a limited difference on biological growth on these surfaces remains a question.
Keywords : sea water concrete chlorine magnesium sulphur thermodynamic modelling
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https://hal.mines-ales.fr/hal-02915328
Contributor : Administrateur Imt - Mines Alès <>
Submitted on : Friday, August 14, 2020 - 10:37:41 AM
Last modification on : Monday, August 24, 2020 - 2:00:19 PM

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Klaartje de Weerdt, Marie Salgues. Interaction between sea water and the surface of concrete – experiences from Norway. Interaction des ouvrages avec leur environnement. Le milieu maritime, p. 139-146, 2018, 978-2-35671-510-4. ⟨hal-02915328⟩

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