Influence of multiple scattering in heterogeneous concrete on results of the surface wave inverse problem

Metais Vincent (1) , Mathieu Chekroun (2) , Loïc Le Marrec (3) , Alain Le Duff (4, 2) , Guy Plantier (4, 2) , Odile Abraham (5)

1 IFSTTAR - Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux
2 LAUM - Laboratoire d'Acoustique de l'Université du Mans
3 IRMAR - Institut de Recherche Mathématique de Rennes
4 GSII - ESEO-GSII
5 IFSTTAR/DS - Direction scientifique

This paper computes the phase velocity dispersion curves of coherent surface waves by taking into account multiple scattering in an elastic matrix containing elastic circular inclusions. The computed dispersion curves are inverted with a global neighborhood algorithm that considers a stratified medium with linear homogeneous and isotropic elastic layers. The impact of multiple scattering on the results is quantified. Since the surface wave phase velocity is not constant with frequency, the inversion provides solutions composed of homogeneous layers. The shear wave velocity profiles of the inverted medium and their impact on concrete porosity estimation is the subject of discussion.

Mots clés: Concrete; Rayleigh waves; multiple scattering; dispersion curves; inverse problem

Domaines: Mécanique des fluides [physics.class-ph]

Metais Vincent, Mathieu Chekroun, Loïc Le Marrec, Alain Le Duff, Guy Plantier, et al.. Influence of multiple scattering in heterogeneous concrete on results of the surface wave inverse problem. NDT & E International, 2016, 79, pp.53-62. ⟨10.1016/j.ndteint.2015.12.004⟩. ⟨hal-01251081⟩