Ultrasonic characterization of cementitious materials using frequency-dependent velocity and attenuation
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چکیده
Non-destructive testing by ultrasounds has been widely used to characterize cementitious materials. Ultrasonic techniques allow estimating mechanical properties of these materials by measuring both velocity and attenuation of the propagating ultrasonic pulse. In this study, both content and size of aggregates in mortar specimens are estimated by taking into account an optimization formulation which combines both frequency-dependent velocity and attenuation profiles. Résumé Les Essais non destructifs par ultrasons ont été largement utilisés pour caractériser les matériaux cimentaires. Les techniques d ́Ultrasons permettent d'estimer les propriétés mécaniques des matériaux cimentaires par la mesure de la vitesse de propagation des impulsions. En outre, les mesures d'atténuation fournissent une estimation des propriétés des microstructures de ces matières. Dans cette étude, le volume de la fraction et la taille des agrégats en échantillons de mortier sont estimés par le biais d'une formulation d ́optimisation combinant la vitesse, l ́atténuation et la fréquence.
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تاریخ انتشار 2009