EIS-Based Sensors for NDE of FRP-Strengthened Concrete Beams: Experiments and Finite Element Simulation
A nondestructive evaluation (NDE) technique based on electrochemical impedance spectroscopy (EIS) is developed for concrete beams strengthened with carbon fiber reinforced polymer sheets to detect the debonding of CFRP from concrete. Copper tape on the surface of the CFRP sheet, stainless steel wire embedded in the concrete, and reinforcing bars were used as sensing elements. In laboratory experiments, the CFRP was progressively debonded using a wedge and impedance measurements were taken using various pairs of electrodes. Changes to the impedance spectra, and the capacitance parameters obtained from equivalent circuit analysis, can be used to assess the global state of the bond between CFRP and concrete. Impedance measurements taken between embedded wire sensors can be used to locate debonded regions. Preliminary finite element simulations are performed to elucidate the experimental observations.
Hong, S.; Udpa, Lalita; Zeng, Z.; and Harichandran, Ronald S., "EIS-Based Sensors for NDE of FRP-Strengthened Concrete Beams: Experiments and Finite Element Simulation" (2005). Civil Engineering Faculty Publications. 31.
Hong, S., Udpa, L, Zeng, Z. & Harichandran, R. EIS-based sensors for NDE of FRP-strengthened concrete beams: experiments and finite element simulation. In International Conference on FRP Composites in Civil Engineering, & Seracino, R. (2005). FRP Composites in Civil Engineering, CICE 2004: Proceedings of the Second International Conference on FRP Composites in Civil Engineering, CICE 2004, 8-10 December 2004, Adelaide, Australia. Leiden: A.A. Balkema, pp. 281-289.