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Caractérisation de l'état de corrosion des aciers dans le béton par cartographie de potentiel

Abstract : Half-cell potential mapping is commonly used to detect corrosion risks in reinforced concrete structures. This method uses a reference electrode positioned on the surface of concrete for measuring potential difference by using a voltmeter connected to the reinforcement. However, there are two major drawbacks in the implementation of this method: the necessity to make an electrical connection to the reinforcement and the electrical continuity of this reinforcement. In order to overcome these disadvantages, a new method is proposed. Instead of using electrical connection to rebar, a second reference electrode is used, also positioned on the surface. These two electrodes configuration gives the electrical potential gradient on the concrete surface. By performing both experimental work and numerical modelling this method configuration is tested. For experimental work, two reinforced concrete slabs (3x3x0.15 meter sized) were cast to be close to actual structural conditions. The corroded areas are created with an accelerated method, using the migration of chloride ions. Corrosion size and localisation are controlled during the experiment. The thickness of the concrete cover has an influence on the measures, for this reason in the first slab reinforcement depth is fixed, while it is variable in the second slab. Concerning modelling, a parametric study using a finite element model is performed. This model allows the study of the influence of several parameters such as resistivity, corroded area size, concrete cover and also the measurement process. It is the analysis of the corrosion current, as well as potential mapping that allows the correlation between the experimental and modelling results. Discussion of both results concludes on the feasibility of this method and confirms its benefits compared to the usual half-cell potential mapping.
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Submitted on : Tuesday, February 12, 2019 - 5:06:06 PM
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2017TOU30383b.pdf
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  • HAL Id : tel-02016528, version 1

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Sylvain Garcia. Caractérisation de l'état de corrosion des aciers dans le béton par cartographie de potentiel. Matériaux composites et construction. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30383⟩. ⟨tel-02016528⟩

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