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Active Microwave Thermography for Evaluation of FRP-Rehabilitated Cement-Based Structures

Fiber reinforced polymer (FRP) composite materials have become important and widely accepted for the rehabilitation of deteriorating concrete structures. Among numerous nondestructive testing and evaluation techniques for FRP-rehabilitated cement-based structures, active microwave thermography (AMT) is an integrated technique that utilizes a microwave-based heat excitation and subsequent thermal monitoring. AMT has shown promise as a nondestructive testing and evaluation technique for the infrastructure and aerospace industries. In this paper, representative simulated and measured results for an AMT inspection of a cement-based material rehabilitated with carbon fiber reinforced polymer (CFRP) composites are presented. Specifically, the thermal contrast and signal-to-noise ratio are provided and discussed as a function of fiber orientation, frequency, and power level. It has been shown that in the case of unidirectional fibers, when the polarization of the incident electromagnetic energy is perpendicular to the fiber direction, a shorter illumination time is required for defect detection as compared to when the incident energy is polarized parallel to the fiber direction. In addition, the saturation time is independent of polarization, so perpendicular polarization is preferred for the inspection of unidirectional FRP-rehabilitated cement-based structures.


Baek, S., W. Xue, M.Q. Feng, and S. Kwon, 2012, “Nondestructive Corrosion Detection in RC through Integrated Heat Induction and IR Thermography,” Journal of Nondestructive Evaluation, Vol. 31, No. 2, pp. 181–190.

Balageas, D., and P. Levesque, 2002, “Mines Detection Using the EMIR Method,” in Proceedings of Quantitative Infrared Thermography 6: QIRT 2002, Dubrovnik, Croatia, 24–27 September 2002, pp. 71–78.

DiMarzio, C.A., C. M. Rappaport, W. Li, M. E. Kilmer, and G. O. Sauermann, 1999, “Microwave-enhanced Infrared Thermography,” in Proceedings of SPIE Photonics East (ISAM, VVDC, IEMB), pp. 337–342.

Foudazi, A., and K.M. Donnell, 2016, “Effect of Sample Preparation on Microwave Material Characterization by Loaded Waveguide Technique,” IEEE Transactions on Instrumentation and Measurement, Vol. 65, pp. 1669–1677.

Foudazi, A., M.T. Ghasr, and K.M. Donnell, 2014a, “Application of Active Microwave Thermography to Inspection of Carbon Fiber Reinforced Composites,” 2014 IEEE AUTOTEST, St. Louis, MO, 15–18 September 2014, doi: 10.1109/AUTEST.2014.6935164.

Foudazi, A. Donnell, K. M. and M. T. Ghasr, 2014b, “Application of Active Microwave Thermography to Delamination Detection,” Proceedings of 2014 IEEE International Instrumentation and Measurement Technology Conference (I2MTC), pp. 1567–1571.

Foudazi, A., I. Mehdipour, K. M. Donnell, and K. H. Khayat, 2015a, “Detection of Steel Fibers in Cement-based Materials by Active Microwave Thermography,” Proceedings 14th International Symposium on Nondestructive Characterization of Materials (NDCM2015), pp. 22–26.

Foudazi, A., M.T. Ghasr, and K.M. Donnell, 2015b, “Characterization of Corroded Reinforced Steel Bars by Active Microwave Thermography,” IEEE Transactions on Instrumentation and Measurement, Vol. 64, No. 9, pp. 2583–2585.

Foudazi, A., C.A. Edwards, M.T. Ghasr, and K.M. Donnell, 2016a, “Active Microwave Thermography for Defect Detection of CFRP-Strengthened Cement-Based Materials,” IEEE Transactions on Instrumentation and Measurement, Vol. 65, No. 11, pp. 2612–2620.

Foudazi, A., T.E. Roth, M.T. Ghasr, and R. Zoughi, 2016b, “Aperture-Coupled Microstrip Patch Antenna Fed by Orthogonal SIW Line for Millimetre-Wave Imaging Applications,” IET Microwaves, Antennas & Propagation, Vol. 11, No. 6, pp. 811–817.

Foudazi, A., I. Mehdipour, K.M. Donnell, and K.H. Khayat, 2016c, “Evaluation of Steel Fiber Distribution in Cement-Based Mortars Using Active Microwave Thermography,” Materials and Structures, Vol. 49, No. 12, pp. 5051–5065.

Ibarra-Castanedo, C., and X. Maldague, 2013, “Chapter 10: Infrared Thermography,” Handbook of Technical Diagnostics: Fundamentals and Application to Structures and Systems, Springer-Verlag Berlin Heidelberg, Germany, pp. 175–220.

Ibarra-Castanedo, C., J.-M. Piau, S. Guilbert, N.P. Avdelidis, M. Genest, A. Bendada, and X.P.V. Maldague, 2009, “Comparative Study of Active Thermography Techniques for the Nondestructive Evaluation of Honeycomb Structures,” Research in Nondestructive Evaluation, Vol. 20, No. 1, pp. 1–31.

Keo, S.-A., D. Defer, F. Breaban, and F. Brachelet, 2013, “Comparison between Microwave Infrared Thermography and CO2 Laser Infrared Thermography in Defect Detection in Applications with CFRP,” Materials Sciences and Applications, Vol. 4, No. 10, pp. 600–605.

Kwon, S.-J., H. Xue, M.Q. Feng, and S. Baek, 2011, “Nondestructive Corrosion Detection in Concrete Through Integrated Heat Induction and IR Thermography,” Proceedings of SPIE 7983, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2011, p. 79831R, doi: 10.1117/12.881121.

Maillard, S., J. Cadith, D. Eschimese, H. Walaszek, H. Mooshofer, J.C. Candore, and J.L. Bodnar, 2010, “Towards the Use of Passive and Active Infrared Thermography to Inspect Metallic Components in the Mechanical Industry,” in Proceedings of QIRT 2010, Quebec, Canada, doi: 10.21611/qirt.2010.081.

Maldague, X.P.V., 2002, “Introduction to NDT by Active Infrared Thermography,” Materials Evaluation, Vol. 60, No. 9, pp. 1060–1073.

Mirala, A., A. Foudazi, M.T. Ghasr, and K.M. Donnell, 2018, “Detection of Flat-Bottom Holes in Conductive Composites Using Active Microwave Thermography,” Journal of Nondestructive Evaluation, Diagnostics, and Prognostics of Engineering Systems, Vol. 1, No. 4, p. 041005, doi: 10.1115/1.4040673.

Orfanidis, S.J., 2002, Electromagnetic Waves and Antennas, Copyright Sophocles J. Orfanidis 1996–2016, available at

Pieper, D., K.M. Donnell, M.T. Ghasr, and E.C. Kinzel, 2014, “Integration of Microwave and Thermographic NDT Methods for Corrosion Detection,” AIP Conference Proceedings, Vol. 1581, No. 1, pp. 1560–1567, doi: 10.1063/1.4865009.

Poudel, A., and T.P. Chu, 2012, “Intelligent Nondestructive Testing Expert System for Carbon/Carbon Composite Brakes Using Infrared Thermography and Air-coupled Ultrasound,” Materials Evaluation, Vol. 70, No. 10, pp. 1219–1229.

Poudel, A., J.Strycek, and T.P. Chu, 2013, “Air-coupled Ultrasonic Testing of Carbon-Carbon Composite Aircraft Brake Disks,” Materials Evaluation, Vol. 71, No. 8, 987–994.

Poudel, A., K.R. Mitchell, T.P. Chu, S. Neidigk, and C. Jacques, 2016, “Non-destructive Evaluation of Composite Repairs by Using Infrared Thermography,” Journal of Composite Materials, Vol. 50, No. 3, pp. 351–363.

Saniie, J., M. Luukkala, A. Lehto, and R. Rajala, 1982, “Thermal Wave Imaging through Radio Frequency Induction Heating,” Electronics Letters, Vol. 18, No. 15, pp. 651–653.

Spicer, Jane W. Maclachlan, Robert Osiander, Leonard C. Aamodt, and Robert B. Givens, 1998, “Microwave Thermoreflectometry for Detection of Rebar Corrosion,” Proceedings of SPIE 3400, Structural Materials Technology III: An NDT Conference, doi: 10.1117/12.300111.

Srinivas, K., A. Siddiqui, and J. Lahiri, 2006, “Thermographic Inspection of Composite Materials,” in Proceedings of the National Seminar on Non-Destructive Evaluation, 7–9 December, Hyderabad, India, pp. 131–143.

Thompson, J.G., and C.T. Uyehara, 2006, “Ultrasonic Thermography Inspection Method and Apparatus,” US Patent 7075084B2.

Vasic, D., V. Bilas, and D. Ambrus, 2004, “Pulsed Eddy-Current Nondestructive Testing of Ferromagnetic Tubes,” IEEE Transactions on Instrumentation and Measurement, Vol. 53, No. 4, pp. 1289-1294.

Wilson, J., G.Y. Tian, I.Z. Abidin, S. Yang, and D. Almond, 2010, “Modelling and Evaluation of Eddy Current Stimulated Thermography,” Nondestructive Testing and Evaluation, Vol. 25, No. 3, pp. 205–218.

Yang, R., and Y. He, 2016, “Optically and Non-optically Excited Thermography for Composites: A Review,” Infrared Physics & Technology, Vol. 75, pp. 26–50.

Zhang, H., R. Yang, Y. He, A.Foudazi, L. Cheng, and G. Tian, 2017, “A Review of Microwave Thermography Nondestructive Testing and Evaluation,” Sensors, Vol. 17, No. 5, 1123, doi: 10.3390/s17051123.

Zhu, W., J.L. Rose, J.N. Barshinger, and V.S. Agarwala, 1998, “Ultrasonic Guided Wave NDT for Hidden Corrosion Detection,” Research in Nondestructive Evaluation, Vol. 10, No. 4, pp. 205–225.

Zoughi, R., 2000, Microwave Non-destructive Testing and Evaluation Principles, Non-Destructive Evaluation Series, Vol. 4, Springer Netherlands, The Netherlands.

Zoughi, R., J.R. Gallion, and M.T. Ghasr, 2016, “Accurate Microwave Measurement of Coating Thickness on Carbon Composite Substrates,” IEEE Transactions on Instrumentation and Measurement, Vol. 65, No. 4, pp. 951–953.

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