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Communication Dans Un Congrès Année : 2011

Interactions between chloride ingress and carbonation in cementitious materials

Résumé

Carbonation and chloride attacks are the major causes of reinforced concrete (RC) structure deterioration by initiation of steel rebar corrosion. These attacks are usually studied separately in the literature. Chloride-induced corrosion takes place mainly in marine environment or in the case of contact with deicing salts, while carbonation is systematically present in all RC structures at a variable degree. Since carbonation leads to significant microstructure changes, the effect of chloride ingress will be different in carbonated and noncarbonated materials. In this paper, combined effects of carbonation and chloride ingress on various physical or chemical properties of cementitious materials (OPC alone or with SCM) are studied. For example, carbonation effects have been investigated experimentally on the chloride binding isotherm and on apparent chloride diffusion coefficients. The materials were carbonated after exposure in natural environment or in accelerated conditions (1.5% CO2). Chloride binding isotherms were assessed by the equilibrium method after exposure to alkaline NaCl solutions. Apparent chloride diffusion coefficients were assessed from migration tests under an electrical field in nonsteady-state conditions. The microstructure was characterized not only by usual techniques such as XRD and TGA-DTA, but also by 29Si and 27Al NMR spectroscopy for a more precise understanding.

Domaines

Matériaux
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Dates et versions

hal-01290709 , version 1 (18-03-2016)

Identifiants

  • HAL Id : hal-01290709 , version 1

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Mickael Saillio, Fabien Barberon, Véronique Baroghel Bouny, Philippe Gegout, Gérard Platret, et al.. Interactions between chloride ingress and carbonation in cementitious materials. The 13th International Congress on Chemistry of Cement, Jul 2011, MADRID, Spain. 7p. ⟨hal-01290709⟩
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