Title of Paper:Interfacial debonding detection in fiber-reinforced polymer rebar-reinforced concrete using electro-mechanical impedance technique

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Date of Publication:2018-05-01

Journal:STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL

Included Journals:SCIE

Volume:17

Issue:3

Page Number:461-471

ISSN No.:1475-9217

Key Words:Electro-mechanical impedance; piezoelectric materials; fiber-reinforced polymer; reinforced concrete; debonding

Abstract:For reinforced concrete structures, the use of fiber-reinforced polymer rebars to replace the steel reinforcement is a topic that is receiving increasing attention, especially where corrosion is a serious issue. However, fiber-reinforced polymer rebar-reinforced concrete always carries the risk of structural failure initiated from the debonding damage that might occur at the reinforcement-concrete interface. This study employed an electro-mechanical impedance-based structural health monitoring technique by applying lead-zirconate-titanate ceramic patches to detect the debonding damage of a carbon fiber-reinforced polymer rebar reinforced concrete. In the experimental study, a carbon fiber-reinforced polymer rebar reinforced concrete specimen was fabricated and it was subjected to a pullout test to initiate the debonding damage at the reinforcement-concrete interface. The impedance and admittance signatures were measured from an impedance analyzer according to the different debonding conditions between the reinforcement and the concrete. Statistical damage metrics, root-mean-square deviation and mean absolute percentage deviation, were used to quantify the changes in impedance signatures measured at the lead-zirconate-titanate patches due to debonding conditions. The results illustrated the capability of the electro-mechanical impedance-based structural health monitoring technique for detecting the debonding damage of fiber-reinforced polymer rebar-reinforced concrete structures.