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Résumé :
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Rebar corrosion is major decay encountered in the field of historical monuments made of reinforced concrete. In order to preserve a maximum of this cultural heritage, reliable on-site diagnosis tools are crucial. The purpose of the present study was to evaluate, on a naturally aged concrete, the impact on one hand of the environmental conditions and on the other hand of the device employed, on the electrochemical techniques commonly used on site. Three sets of electrochemical measurements (half-cell potential, resistivity and polarisation resistance) were carried out on Notre-Dame de Royan Church, affected by both carbonation and slight chloride pollution. The results have indicated that the seasonal impact was low compared to that of a raining event, but also that depending on the device used, significant differences were observed in the polarisation resistance values measured. However, a reliable qualitative diagnosis was systematically possible.
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