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Ultrasonic characterization of cementitious materials using frequency-dependent velocity and attenuation
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. To assess average size and volume fraction of inclusions in mortar specimens, an inverse procedure of a multiple scattering model was carried out. Effective frequency-dependent velocity and attenuation were calculated by means of an N-phase version of Waterman-Truell model, taking into account a three-phase material: cement matrix, aggregates (microspheres) and entrapped air voids. The predictions of both size and volume fraction were close to nominal values for low and medium concentrations, but in case of high concentrations it is necessary to use a more suitable scattering model. To this end, the numerical implementation of such a multiple scattering model is under development. Furthermore, it is highlighted the difficulty of estimating simultaneously the size and volume fraction of mortar specimens. To further improve the accuracy of the estimation, the joint interaction of size and volume fraction and its effect into velocity and attenuation profiles ought to be studied.
Ultrasonic characterization of cementitious materials using frequency-dependent velocity and attenuation
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. To assess average size and volume fraction of inclusions in mortar specimens, an inverse procedure of a multiple scattering model was carried out. Effective frequency-dependent velocity and attenuation were calculated by means of an N-phase version of Waterman-Truell model, taking into account a three-phase material: cement matrix, aggregates (microspheres) and entrapped air voids. The predictions of both size and volume fraction were close to nominal values for low and medium concentrations, but in case of high concentrations it is necessary to use a more suitable scattering model. To this end, the numerical implementation of such a multiple scattering model is under development. Furthermore, it is highlighted the difficulty of estimating simultaneously the size and volume fraction of mortar specimens. To further improve the accuracy of the estimation, the joint interaction of size and volume fraction and its effect into velocity and attenuation profiles ought to be studied.
Ultrasonic characterization of cementitious materials using frequency-dependent velocity and attenuation
Ultraschallcharakterisierung zementöser Werkstoffe mittels frequenzabhängiger Geschwindigkeit und Schwächung
Molero Armenta, Miguel Angel (author) / Segura, Ignacio (author) / Hernandez, Margarita (author) / Garcia Izquierdo, Miguel Angel (author) / Anaya, Jose (author)
2009
6 Seiten, 2 Bilder, 2 Tabellen, 9 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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