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Micro-concrete ageing ultrasonic identification
The immersed ultrasonic and impact laser methods are successfully applied to separate increasing ageing levels of micro-concrete specimens. Both of them identify as well the matrix stiffness coefficients, with a promising accuracy. The model of Hudson accounts for the porous elastic medium analysis. It provides magnitude orders, to confirm the main trends of the observed alterations. Improving the predictivity would involve to consider for example the local anisotropy of the layered scheme, and a better description of the cracks elasticity moduli. These parameters should describe more complex conditions like local heterogeneities interfering with the included air and water, improving the ultrasonic method, sensitivity knowledge with the micro-concrete water content. On the experimental point of view, according to the material granularity, it can be expected that the generated wavelength plays an important role to optimize the operating conditions. Especially, the frequency of the waves - 250 kHz - seems slightly too high to homogenize regularly the material. A more systematic investigation of this parameter is relevant to ensure the ray propagation hypothesis, currently admitted by the ultrasonic analysis.
Micro-concrete ageing ultrasonic identification
The immersed ultrasonic and impact laser methods are successfully applied to separate increasing ageing levels of micro-concrete specimens. Both of them identify as well the matrix stiffness coefficients, with a promising accuracy. The model of Hudson accounts for the porous elastic medium analysis. It provides magnitude orders, to confirm the main trends of the observed alterations. Improving the predictivity would involve to consider for example the local anisotropy of the layered scheme, and a better description of the cracks elasticity moduli. These parameters should describe more complex conditions like local heterogeneities interfering with the included air and water, improving the ultrasonic method, sensitivity knowledge with the micro-concrete water content. On the experimental point of view, according to the material granularity, it can be expected that the generated wavelength plays an important role to optimize the operating conditions. Especially, the frequency of the waves - 250 kHz - seems slightly too high to homogenize regularly the material. A more systematic investigation of this parameter is relevant to ensure the ray propagation hypothesis, currently admitted by the ultrasonic analysis.
Micro-concrete ageing ultrasonic identification
Ultraschallidentifizierung der Alterung von Mikrobetonproben
Cheng, C. (author) / Deschamps, M. (author) / Panet, M. (author) / Poncelet, O. (author) / Audoin, B. (author)
2000
8 Seiten, 13 Bilder, 11 Tabellen, 17 Quellen
Conference paper
English
Ultraschall , Identifizierung , Beton , Probe , Alterung , Voigt-Modell , Zement , Laser , Elastizitätskonstante , Frost-Tau-Test , Schlagprüfung , Matrix (Grundmasse) , Federkonstante , Elastizitätsmodul , Riss , Anisotropie , Wassergehalt , Wellenlänge
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