Effect of water saturation and porosity on the nonlinear elastic response of concrete / Cédric Payan in Cement and concrete research, Vol. 40 N° 3 (Mars 2010)  

Effect of water saturation and porosity on the nonlinear elastic response of concrete [texte imprimé] / Cédric Payan, Auteur ; Garnier, Bernard, Auteur ; Joseph Moysan, Auteur . - 2012 . - pp. 473–476.
Bibliogr.
Langues : Anglais (eng)
in Cement and concrete research > Vol. 40 N° 3 (Mars 2010) . - pp. 473–476

Mots-clés :	Characterization  Spectroscopy Mechanical Properties Nonlinear acoustics
Résumé :	Nonlinear interaction of a monochromatic elastic wave with a low frequency should be a good tool for non-destructive evaluation of existing concrete structures. Nonlinear indicators have already proved efficient in detecting global damage by exhibiting a significant sensitivity regarding classical linear ultrasonic methods like wave speed or attenuation. However, it is necessary to understand the influence of some structural parameters such as porosity, stress state, or water saturation on the nonlinear processes. In this way, a recent model containing all of these potential contributors is presented in this paper. It is sustained by nonlinear interaction experiments in impact mode. This method reveals a great potential for in situ measurements with a low frequency propagating into the whole structure. We make use of a calibrated concrete sample's series, conditioned at different water saturation states, to quantify the influence of water content and porosity on the nonlinear response of concrete.
En ligne :	http://www.sciencedirect.com/science/article/pii/S0008884609003159