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Reliability of the impact-echo method on thickness measurement of concrete elements
The present study aims at the applicability and examining the reliability of the impact-echo method on thickness measurements with reference to the geometry of the specimen and sampling data measurements. The accuracy of impact-echo thickness measurement derives from measuring not one but multiple wave reflections, and from the possibility of repeatable and reproducible waveforms. Studies have been carried out using a modified 'DOCtor' impact-echo system in manual scanning mode. The slab specimens are designed and constructed at Structural Engineering Research Centre (SERC), exclusively for the data generation and validation of different NDT techniques. An average of two impacts has been taken at each point along the line. Lines are scanned by selective sampling. For some selective lines, scanning has been done by selective as well as random sampling. Time domain waveforms have been recorded and the resulting frequency spectra have been used to analyse the data. It is observed that the impact-echo gives reliable results on thickness measurement. However, the reliability of thickness measurement is questionable when the scanning points are close to the boundaries of the slab / member. In the limited study, it is observed that the frequency spectra results of the line scan are different for selective and random sampling. It is further observed that the sampling is to be done carefully and only reproducible signals may be recorded.
Reliability of the impact-echo method on thickness measurement of concrete elements
The present study aims at the applicability and examining the reliability of the impact-echo method on thickness measurements with reference to the geometry of the specimen and sampling data measurements. The accuracy of impact-echo thickness measurement derives from measuring not one but multiple wave reflections, and from the possibility of repeatable and reproducible waveforms. Studies have been carried out using a modified 'DOCtor' impact-echo system in manual scanning mode. The slab specimens are designed and constructed at Structural Engineering Research Centre (SERC), exclusively for the data generation and validation of different NDT techniques. An average of two impacts has been taken at each point along the line. Lines are scanned by selective sampling. For some selective lines, scanning has been done by selective as well as random sampling. Time domain waveforms have been recorded and the resulting frequency spectra have been used to analyse the data. It is observed that the impact-echo gives reliable results on thickness measurement. However, the reliability of thickness measurement is questionable when the scanning points are close to the boundaries of the slab / member. In the limited study, it is observed that the frequency spectra results of the line scan are different for selective and random sampling. It is further observed that the sampling is to be done carefully and only reproducible signals may be recorded.
Reliability of the impact-echo method on thickness measurement of concrete elements
Zuverlässigkeit der Impaktmethode bei der Dickenmessung von Betonelementen
Sangoju, Bhaskar (author) / Murthy, S.G.N. (author) / Parthasarathy, Srinivasan (author) / Wiggenhauser, Herbert (author) / Ravisankar, Kapali (author) / Iyer, Nagesh R. (author) / Lakshmanan, Narayanan (author)
2009
6 Seiten, 11 Bilder, 7 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
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