Study of Debonding of Composite Material from a Deforming Concrete Beam Using Infrared Thermography
This article focuses on the cycle of experimental studies of the formation of cracks and debondings in the concrete reinforced with carbon fiber. This research was carried out in Perm National Research Polytechnic University. A series of CFRP-strengthened RC beams was tested to investigate the influence of preload and crack repairing factors on CFRP debonding. IRT was applied to detect the early stage of IC debonding during the laboratory bending tests. It was found that for the beams strengthened under load after crack injecting, СFRP debonding strain is 4-65% lower than for the preliminary strengthened beams. The beams strengthened under the load had a relative area of debonding of 2 times higher than preliminary strengthened beams. The СFRP debonding strain is weakly dependent on the strength of the concrete substrate. For beams with a transverse wrapping anchorage in support sections FRP debonding is not a failure mode.
 J.G. Teng. Failure modes of FRP-strengthened Restructures / 26th Conference on Our World in Concrete & Structures: 27 - 28 August 2001, Singapore. рр. 627-634..
 SP 164.1325800.2014. Strengthening of reinforced concrete structures with composite materials. Design rules.
 ACI 440.2R-08. Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures. ACI. 2008.
 ZHANG Ai-hui JIN Wei-liang, LI Gui-bing, Behavior of preloaded RC beams strengthened with CFRP laminates. - Journal of Zhejiang University SCIENCE A, 2006 7(3), 436-444.
 K. Parikh, C.D. Modhera. Application of GFRP on preloaded retrofitted beam for enhancement in flexural strength. – International journal of civil and structural engineering, Volume 2, № 4, 2012, pp. 1070-1080.
 Y.A. Al-Salloum. Flexural behavior of rc beams strengthened with frp composite sheets subjected to different load cases. King Saud University, Saudi Arabia. http://faculty.ksu.edu.sa/ysalloum/Documents/My%20Papers/Flexure%20UK%202006.pdf.
 M. R. Valluzzi, E. Grinzato, C. Pellegrino, C. Modena. IR thermography for interface analysis of FRP laminates externally bonded to RC beams. Materials and Structures (2009) 42, рр. 25–34..
 А. Shirazi V.M. Karbhar, Quantifying defects and progression of damage in FRP rehabilitation of concrete through IR thermography. Asia-Pacific Conference on FRP in Structures (APFIS 2007). 2007 International Institute for FRP in Construction..
 F. Taillade, M. Quiertant, K. Benzarti, J.Dumoulin, Ch. Aubagnac. Nondestructive evaluation of FRP strengthening systems bonded on RC structures using pulsed stimulated infrared thermography / IFSTTAR, F-75015 Paris. рр. 193-208.
 Determination of thermography modes for recording delamination between composite material and reinforced concrete structures/ A. Bykov, V. Matveenko, G. Serovaev, I. Shardakov, A. Shestakov // Problems of Deformation and Fracture in Materials and Structures: sel., peer rev. papers from the All-Russ. Conf. on Problems of Deformation and Fracture in Materials and Structures, June 17-19, 2015, Perm, Russia / Ed.: V. P. Matveenko, A. A. Tashkinov, D. A. Chinakhov. – Durnten-Zurich: TTP, 2016. – (Solid State Phenomena; vol. 243). - P. 97-104.