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Experimental investigation of the acoustic wave propagation in concrete structures after impact excitation
Impact echo as a NDT method is successfully used for the investigation of concrete structures. However, there are some cases in which the interpretation of the results is not always well defined. Thus a detailed examination of the wave propagation in concrete is highly relevant. This paper describes useful techniques for that purpose. By using a scanning laservibrometer it is now possible to get a visualization of sound waves propagating through concrete structures. The interaction of the propagating sound waves with empty tendon ducts as well as their behaviour when reaching the backwall of the specimen is investigated. Impact-Echo measurements in transmission arrangement, in which the transducer is placed opposite to the excitation, serve for a further investigation of the so-called geometry effects, which are obtained from structures with compact dimensions. In another experimental setup the excitation source is fixed to one point and the transducer mounted to a scanner measures the surface displacements for all points of the specimen in phase with the excitation. Using this data, it becomes possible to visualize and analyze the instantaneous surface displacements for every point on the specimen and the wave propagation along the surfaces becomes apparent.
Experimental investigation of the acoustic wave propagation in concrete structures after impact excitation
Impact echo as a NDT method is successfully used for the investigation of concrete structures. However, there are some cases in which the interpretation of the results is not always well defined. Thus a detailed examination of the wave propagation in concrete is highly relevant. This paper describes useful techniques for that purpose. By using a scanning laservibrometer it is now possible to get a visualization of sound waves propagating through concrete structures. The interaction of the propagating sound waves with empty tendon ducts as well as their behaviour when reaching the backwall of the specimen is investigated. Impact-Echo measurements in transmission arrangement, in which the transducer is placed opposite to the excitation, serve for a further investigation of the so-called geometry effects, which are obtained from structures with compact dimensions. In another experimental setup the excitation source is fixed to one point and the transducer mounted to a scanner measures the surface displacements for all points of the specimen in phase with the excitation. Using this data, it becomes possible to visualize and analyze the instantaneous surface displacements for every point on the specimen and the wave propagation along the surfaces becomes apparent.
Experimental investigation of the acoustic wave propagation in concrete structures after impact excitation
Experimentelle Untersuchung der Ausbreitung akustischer Wellen in Betonstrukturen nach Schlaganregung
Algernon, Daniel (author) / Wiggenhauser, Herbert (author)
2005
12 Seiten, 22 Bilder, 9 Quellen
Conference paper
English
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