Characterisation of the steel concrete interface submitted to chloride-induced-corrosion

Authors

  • V. L'Hostis,

    Corresponding author
    1. CEA Saclay, CEA, DEN, DPC, SECR, Laboratoire d'Etude du Comportement des Bétons et des Argiles, 91191 Gif-sur-Yvette (France)
    • CEA Saclay, CEA, DEN, DPC, SECR, Laboratoire d'Etude du Comportement des Bétons et des Argiles, 91191 Gif-sur-Yvette (France)
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  • E. Amblard,

    1. CEA Saclay, CEA, DEN, DPC, SECR, Laboratoire d'Etude du Comportement des Bétons et des Argiles, 91191 Gif-sur-Yvette (France)
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  • W. Guillot,

    1. CEA Saclay, CEA, DEN, DPC, SECR, Laboratoire d'Etude du Comportement des Bétons et des Argiles, 91191 Gif-sur-Yvette (France)
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  • C. Paris,

    1. Laboratoire de Dynamique, Interactions et Réactivité (LADIR) UMR 7075, CNRS and UPMC – Universite Pierre et Marie Curie – Paris 6, 4, Place Jussieu, 75252 Paris Cedex 05 (France)
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  • L. Bellot-Gurlet

    1. Laboratoire de Dynamique, Interactions et Réactivité (LADIR) UMR 7075, CNRS and UPMC – Universite Pierre et Marie Curie – Paris 6, 4, Place Jussieu, 75252 Paris Cedex 05 (France)
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Abstract

This paper deals with the characterisation by means of electrochemical, gravimetric and analytical methods of chloride-induced-corrosion behaviour of steel coupons embedded in chloride-containing-cement pastes. Corrosion rates were estimated from electrochemical measurements as well as gravimetric ones. They vary from 2.6 to 5.7 µm/year for 5 and 10 g/L chloride-containing-cement pastes. Analytical characterisations (including optical and electronical microscopy and Raman micro-spectroscopy) showed that corrosion patterns are not depending on the chloride content of the cement paste (5 and 10 g/L chloride in the interstitial solution). A localised corrosion pattern composed of pits growing inside the metallic substratum, a corrosion products layer (CPL) and a transformed medium (TM) was pointed out. CPL can be divided into two sub-layers (CPL1 and CPL2), characterised by the presence or absence of calcium coming from the cement matrix.

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