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Correction published on 3 January 2019, see Sensors 2019, 19(1), 147.
Open AccessArticle

Processing Ultrasonic Data by Coda Wave Interferometry to Monitor Load Tests of Concrete Beams

Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany
RWTH Aachen University (now WTM Engineers GmbH), Templergraben 55, 52062 Aachen, Germany
Bundesanstalt für Straßenwesen (BASt), Bruederstr. 53, 51427 Bergisch Gladbach, Germany
Author to whom correspondence should be addressed.
Sensors 2018, 18(6), 1971;
Received: 11 May 2018 / Revised: 5 June 2018 / Accepted: 12 June 2018 / Published: 19 June 2018
Ultrasonic transmission measurements have been used for decades to monitor concrete elements, mostly on a laboratory scale. Recently, coda wave interferometry (CWI), a technique adapted from seismology, was introduced to civil engineering experiments. It can be used to reveal subtle changes in concrete laboratory samples and even large structural elements without having a transducer directly at the place where the change is taking place. Here, several load tests until failure on large posttensioned concrete beams have been monitored using networks of embedded transducers. To detect subtle effects at the beginning of the experiments and cope with severe changes due to cracking close to failure, the coda wave interferometry procedures had to be modified to an adapted step-wise approach. Using this methodology, we were able to monitor stress distribution and localize large cracks by a relatively simple technique. Implementation of this approach on selected real structures might help to make decisions in infrastructure asset management. View Full-Text
Keywords: ultrasound; concrete; monitoring; coda wave interferometry ultrasound; concrete; monitoring; coda wave interferometry
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Niederleithinger, E.; Wang, X.; Herbrand, M.; Müller, M. Processing Ultrasonic Data by Coda Wave Interferometry to Monitor Load Tests of Concrete Beams. Sensors 2018, 18, 1971.

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