BREYSSE, Denys; YOTTE, Sylvie; SALTA, Manuela; SCHOEFS, Franck

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Proceeding of 1st International Conference on Applications Heritage and Constructions in Coastal and Marine Environment, 2008, Lisboa.

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Progressive corrosion of reinforced concrete structures and of steel structures in marineenvironment has important economical consequences. The quantitative forecasting of corrosiondevelopment remains difficult, which limits the development of validated preventive maintenancestrategies. Difficulties come from the spatial variability of material properties, the temporalvariability of environment, the sensitivity of non destructive measurements to changingenvironmental conditions. The reinforced concrete Barra Bridge, Portugal, has been thoroughlyinvestigated, many non destructive and semi destructive tests having been performed on severalpiers, including reinforcement cover, potential and corrosion rate measurements. These data areused as input data for modelling the development of corrosion and its variability. A laboratoryprogram in which the current of corrosion has been monitored under varying temperature andhumidity has given a series of results which have been analyzed. A model derived from theanalysis of these results enables to account for the influence of these parameters and to help thedecision process regarding the corrosion state and the forecasting of its evolution.< Réduire

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corrosion

damage

material variability

non destructive testing

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Uncertainties in NDT condition assessment of corroding structures in marine environment

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