Interfacial debonding detection in fiber-reinforced polymer rebar–reinforced concrete using electro-mechanical impedance technique

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.

Experimental Research on Bond Behavior between GFRP Bars and Stirrups-Confined Concrete

“…The high variation in Figure 14 revealed that the values of these parameters in the BPE and CMR models are highly affected by both failure mode and stirrups. The parameters α β s r which were obtained from specimens with stirrups (R1-C1-20-Y, R2-C1- 16 Figure 16. The analytical curves that were obtained by using the parameters fitted to its experimental counterpart are represented by BPE and CMR models, and the analytical curves obtained by using the medians of parameter are represented by BPE* and CMR* Models.…”

Durability Prediction of GFRP Rebar Based on Elastic Modulus Degradation

“…Furthermore, while corroded steel bars display visible warning signals such as expanded volume which leads to crack of concrete (Al-Salloum et al, 2013), degraded GFRP bars do not show any signals, which impose great challenges for engineers to determine the degradation degree of GFRP bars inside GFRP-RC structures. Some effective non-destructive evaluation developed techniques (Li et al, 2016(Li et al, , 2017Jiang et al, 2017;Xu et al, 2018) for monitoring the initial bonding quality and long-term efficiency of the interfacial bonding between GFRP bars and concrete. However, so far, there has not been any relevant technology or method to monitor the tensile strength degradation of GFRP bars in practical service.…”

An Optical Interferometric Triaxial Displacement Sensor for Structural Health Monitoring: Characterization of Sliding and Debonding for a Delamination Process

“…Therefore, it is very important to detect both sliding and debonding in RC in time to ensure its safety and determine its fitness for service. A number of sliding and debonding sensors have been developed with various sensing mechanisms, primarily including mechanical, electrical, and acoustic [ 1 , 2 , 3 , 5 , 6 , 7 ]. Acoustic emission (AE) is one of the most powerful tools to assess the integrity of the RC structure, which correlates the AE parameters with the localized changes inside the structure [ 5 ].…”