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Sensors to monitor CFRP/concrete bond in beams using electrochemical impedance spectroscopy
In reinforcing concrete bars with FRP plates debonding of the plates and ripping of concrete are common failure modes initiated due to highly localized stress concentration in the interface layer. It is therefore important to identify the integrity of the interfacial bond between concrete and the FRP using effective NDE (nondestructive evaluation techniques). EIS (electrochemical impedance spectroscopy) is used for CFRP (carbon fiber-reinforced polymer) debonding in concrete beams strengthened with CFRP sheets. Sensor elements (electrodes) consisted of : copper tape with a conductive adhesive applied to the outside of the CFRP prior to application of the epoxy; stainless steel wire placed in grooves on the bottom face of the concrete; and a reinforcing bar. Impedance measurements were taken between pairs of sensors using a potentiostat. An equivalent circuit was fitted to each measured impedance spectrum and the circuit parameters were estimated. Variations in the measured impedance spectra and the equivalent circuit parameters due to different environmental conditions and debonding of the CFRP sheet were studied in controlled and ambient conditions.
Sensors to monitor CFRP/concrete bond in beams using electrochemical impedance spectroscopy
In reinforcing concrete bars with FRP plates debonding of the plates and ripping of concrete are common failure modes initiated due to highly localized stress concentration in the interface layer. It is therefore important to identify the integrity of the interfacial bond between concrete and the FRP using effective NDE (nondestructive evaluation techniques). EIS (electrochemical impedance spectroscopy) is used for CFRP (carbon fiber-reinforced polymer) debonding in concrete beams strengthened with CFRP sheets. Sensor elements (electrodes) consisted of : copper tape with a conductive adhesive applied to the outside of the CFRP prior to application of the epoxy; stainless steel wire placed in grooves on the bottom face of the concrete; and a reinforcing bar. Impedance measurements were taken between pairs of sensors using a potentiostat. An equivalent circuit was fitted to each measured impedance spectrum and the circuit parameters were estimated. Variations in the measured impedance spectra and the equivalent circuit parameters due to different environmental conditions and debonding of the CFRP sheet were studied in controlled and ambient conditions.
Sensors to monitor CFRP/concrete bond in beams using electrochemical impedance spectroscopy
Sensorische Überwachung der CFRP/Beton-Bindung an Trägern unter Verwendung der elektrochemischen Impedanzspektroskopie
Hong, Sangdo (author) / Harichandran, Ronald S. (author)
Journal of Composites for Construction ; 9 ; 515-523
2005
9 Seiten, 14 Bilder, 2 Tabellen, 16 Quellen
Article (Journal)
English
Beton , carbonfaserverstärkter Kunststoff , Träger (Bauwesen) , Klebverbindung , Sensor mechanischer Größen , Impedanzsensor , Zustandsüberwachung , Impedanzspektroskopie , Elektrochemie , Haftfestigkeit , zerstörungsfreie Prüfung , Festigkeitsverlust , Platte (Halbzeug) , Ankleben , elektrochemische Impedanzspektroskopie
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