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Tests and assessments of NDT methods for concrete bridges

  • A research project is described involving a comparison of different non-destructive test methods for concrete bridges. A cooperative test series was started with the aim to compare and evaluate the performance and benefits of the latest technical developments in this field. For this purpose test specimens with localized defects were produced. Different modifications of radar, ultrasonic-echo and impact-echo methods were investigated. Including two- and three- dimensional reconstruction models. The experiments were accompanied by numerical simulation of the propagation of sound waves and microwaves. The results showed that the radar and the ultrasonic methods were efficient tools to locate the tendon ducts accurately if the reinforcing bars were not to narrowly spaced. The ultrasonic imaging methods were capable of identifying injection and compaction faults in a blind test. The good performance of the impact-echo method with regard to locating tendon ducts which was claimed in severalA research project is described involving a comparison of different non-destructive test methods for concrete bridges. A cooperative test series was started with the aim to compare and evaluate the performance and benefits of the latest technical developments in this field. For this purpose test specimens with localized defects were produced. Different modifications of radar, ultrasonic-echo and impact-echo methods were investigated. Including two- and three- dimensional reconstruction models. The experiments were accompanied by numerical simulation of the propagation of sound waves and microwaves. The results showed that the radar and the ultrasonic methods were efficient tools to locate the tendon ducts accurately if the reinforcing bars were not to narrowly spaced. The ultrasonic imaging methods were capable of identifying injection and compaction faults in a blind test. The good performance of the impact-echo method with regard to locating tendon ducts which was claimed in several publications could not be validated in the present investigations. The simulation models provided valuable information on how to improve the experimental test program and its evaluation.zeige mehrzeige weniger

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Metadaten
Autor*innen:Herbert WiggenhauserORCiD, Martin KrauseORCiD, J. Krieger
Persönliche Herausgeber*innen:R. Medlock
Dokumenttyp:Beitrag zu einem Sammelband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):Structural materials technology III
Jahr der Erstveröffentlichung:1999
Verlag:SPIE
Verlagsort:Bellingham, Wash.
Jahrgang/Band:3400
Erste Seite:258
Letzte Seite:269
Freie Schlagwörter:Non-destructive testing in civil engineering; compaction faults; concrete bridges; ducts; impact-echo; injection faults; magnetic stray field; pulse radar; reconstruction calculation; round robin test; ruptures in prestressing reinforcement; synthetic aperture focusing technique (SAFT); tendons; ultrasonic testing
Veranstaltung:Structural materials technology III
Veranstaltungsort:San Antonio, TX, USA
Beginndatum der Veranstaltung:1998-03-31
Enddatum der Veranstaltung:1998-04-03
DOI:10.1117/12.300098
ISBN:0-8194-2849-3
Bemerkung:
Serientitel: SPIE proceedings series – Series title: SPIE proceedings series
Verfügbarkeit des Dokuments:Weder Datei noch physisches Exemplar vorhanden ("No Access")
Datum der Freischaltung:19.02.2016
Referierte Publikation:Nein
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