Ultrasonic slow dynamics to probe concrete aging and damage
Résumé
The stiffness of concrete experiences a drop immediately after a moderate mechanical solicitation. Then the stiffness rises back logarithmically toward its initial value. This Slow Dynamics behavior has been probed by macroscopic quantities averaged over the sample volume, including resonant frequency. This article presents a different approach based on diffuse acoustic wave spectroscopy, a technique that is directly sensitive to the details of the sample structure. The parameters of the dynamics are found to depend on mechanical and thermal damage of the medium. Results confirm that slow dynamics can be used onsite to assess the level of damage of a given structure.
Domaines
Mécanique [physics.med-ph]
Origine : Fichiers produits par l'(les) auteur(s)