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Ultrasonic inspection for the detection of debonding in CFRP-reinforced concrete

TitleUltrasonic inspection for the detection of debonding in CFRP-reinforced concrete
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication2018
AuthorsE. Ribolla, La Malfa, M. Hajidehi Rezaee, Rizzo P., G. Scimemi Fileccia, Spada A., and Giambanco G.
JournalStructure and Infrastructure Engineering
Keywords2D finite element analysis, Akaike information criterion, Bonding, Carbon fiber reinforced plastics, CFRP reinforced concrete, Concrete testing, Concretes, Cost effectiveness, Equivalent time lengths, Fiber reinforced materials, Fiber reinforced plastics, Fibre reinforced plastic (FRP), Finite element method, Interfaces (materials), Materials testing, Nanocomposites, Non destructive testing, Non-destructive evaluation methods, Nondestructive examination, Reinforced concrete, Retrofitting, Ultrasonic applications, Ultrasonic methods, Ultrasonic testing

Fibre-reinforced plastic (FRP) composites are extensively used to retrofit civil structures. However, the quality and the characteristics of the bond between the FRP and the structure are critical to ensure the efficacy of the retrofit. For this reason, effective non-destructive evaluation (NDE) methods are often necessary to assess the bonding conditions. This article presents an ultrasonic technique for detecting defects at the FRP-substrate interface. The technique uses the Akaike Information Criterion, to detect automatically the onset of the ultrasonic signals, and the novel Equivalent Time Lenght (ETL) parameter, to quantify the energy of the propagating ultrasonic signals along the interface between FRP and concrete. The uniqueness of the ETL is that it is not affected by the coupling conditions between the ultrasonic probes and the structure. The proposed NDE technique has been tested numerically by performing 2D Finite-Element analysis and experimentally on reinforced concrete samples. The results show that the method is robust and cost-effective. © 2017 Informa UK Limited, trading as Taylor & Francis Group.


cited By 3

Citation KeyLaMalfaRibolla2018807