Évaluation de l'état du béton par la technique d'analyse spectrale des ondes de Rayleigh

The evaluation of concrete deteriorations is essential to optimize the costs and ensure that the required retrofits are durable. A study undertaken on many experimental concrete specimens has shown that an analysis of the dispersion of Rayleigh waves enables differentiation between concrete of different mechanical properties, description of the evolution of these properties with respect to depth, and detection of defaults in the concrete mass. The study of the different monitoring and processing parameters associated with this technique reveals that the choice of the type of emission source must be accomplished with respect to the thickness of the material under study, and that the distance between the emission source and the sensors as well as the distance between sensors do not have any effect on the Rayleigh wave speed profile. A new monitoring configuration is proposed to improve the experimental procedure.Key words: concrete, deterioration, nondestructive tests, spectral analysis of Rayleigh waves.[J...