Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Non-contact ultrasonic interrogation of concrete
There is already extensive use of ultrasonics in concrete diagnostics. These systems typically use narrow-bandwidth piezoelectric transducers, which must be in contact with the concrete surface, an example being the PUNDIT, (Portable Ultrasonic Non destructive Digital Indicating Tester). This is the most common approach to field testing. In this paper, it is compared to a new approach, using air-coupled ultrasound. This combines a pulse compression technique with electrostatic broadband transducers in air, so that contact to the sample is avoided. A comparison of results obtained using the PUNDIT and non-contact (NC) systems is presented here. There are some interesting differences in the data when the concrete material under test is non-homogeneous. They imply that the NC system is more sensitive to the paste properties, whereas the converse is true for the PUNDIT system, which seems to couple energy to the sample primarily via the aggregate. It is suspected, however, that the air-coupled system may be more sensitive to changes in properties of the paste as it cures, and this may be of interest to researchers in this area.
Non-contact ultrasonic interrogation of concrete
There is already extensive use of ultrasonics in concrete diagnostics. These systems typically use narrow-bandwidth piezoelectric transducers, which must be in contact with the concrete surface, an example being the PUNDIT, (Portable Ultrasonic Non destructive Digital Indicating Tester). This is the most common approach to field testing. In this paper, it is compared to a new approach, using air-coupled ultrasound. This combines a pulse compression technique with electrostatic broadband transducers in air, so that contact to the sample is avoided. A comparison of results obtained using the PUNDIT and non-contact (NC) systems is presented here. There are some interesting differences in the data when the concrete material under test is non-homogeneous. They imply that the NC system is more sensitive to the paste properties, whereas the converse is true for the PUNDIT system, which seems to couple energy to the sample primarily via the aggregate. It is suspected, however, that the air-coupled system may be more sensitive to changes in properties of the paste as it cures, and this may be of interest to researchers in this area.
Non-contact ultrasonic interrogation of concrete
Berührungslose Ultraschallprüfung von Beton
Berriman, J. (Autor:in) / Gan, T.H. (Autor:in) / Hutchins, D.A. (Autor:in) / Purnell, P. (Autor:in)
2003
9 Seiten, 4 Bilder, 1 Tabelle, 14 Quellen
(Nicht paginiert)
Aufsatz (Konferenz)
Datenträger
Englisch
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