Abstract
Non-destructive (ND) evaluation by thermographic analysis was applied to reinforced concrete (RC) beams strengthened with CFRP laminates, to assess the quality of the interface between reinforcement and substrate before and under loading, during laboratory bending tests. The proper algorithm for processing data acquired from the thermographic system was first selected by testing reduced-scale fiber reinforced polymer (FRP)-strengthened concrete slabs with artificial defects and anomalies, deliberately placed at the interface. Portable heating equipment was purposely set-up to allow continuous scanning along the loaded beams. Results showed that infrared thermography (IRT) can supply significant qualitative and quantitative information on bonding of FRP materials applied to structural substrates, for both preliminary and in-situ investigations, by means of a reliable low-time-consuming procedure. Cross-evaluation of crack patterns during bending tests and thermographic results are also presented.
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Maeda T, Asano Y, Sato Y, Ueda T, Kakuta Y (1997) A study on bond mechanism of carbon fiber sheet. In: Non-metallic (FRP) reinforcement for concrete structures. 3rd International symposium, vol 1, Japan Concrete Institute, Sapporo, pp 279–285
Chen JF, Teng JG (2001) Anchorage strength models for FRP and steel plates bonded to concrete. ASCE J Struct Eng 127(7):784–791
Nakaba K, Kanakubo T, Furuta T, Yoshizawa H (2001) Bond behaviour between fiber-reinforced polymer laminates and concrete. ACI Struct J 98(3):359–367
Boschetto G, Pellegrino C, Tinazzi D, Modena C (2006) Bond behaviour between FRP sheets and concrete: an experimental study. Paper presented at the 2nd fib congress, Naples, Italy, 5–8 June 2006
Pellegrino C, Tinazzi D, Modena C (2008) Experimental study on bond behavior between concrete and FRP reinforcement. ASCE J Compos Constr 12(2)
Pellegrino C, Modena C (2002) FRP shear strengthening of RC beams with transverse steel reinforcement. ASCE J Compos Constr 6(2):104–111
Pellegrino C, Modena C (2006) FRP shear strengthening of RC beams: experimental study and analytical modelling. ACI Struct J 103(5):720–728
Smith ST, Teng JG (2002) FRP-strengthened RC beams. I: review of debonding strength models. Eng Struct 24(4):385–395
Yoshizawa H, Myojo T, Okoshi M, Mizukoshi M, Kliger HS (1996) Effect of sheet bonding condition on concrete members having externally bonded carbon fiber sheet. 4th Materials engineering conference, ASCE annual convention, Washington DC
De Lorenzis L, Miller B, Nanni A (2001) Bond of FRP laminates to concrete. ACI Mater J 98(3):256–264
Pesic N, Pilakoutas K (2003) Concrete beams with externally bonded flexural FRP-reinforcement: analytical investigation of debonding failure. Compos Part B 34:327–338
Wu Z, Yin J (2003) Fracturing behaviors of FRP-strengthened concrete structures. Eng Fract Mech 70:1339–1355
ACI Committee 440 (2002) Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures (ACI 440.2R-02). American Concrete Institute, Farmington Hills, Michigan
Fib Task Group 9.3 (2001) Externally bonded FRP reinforcement for RC structures. Fib Bulletin 14, Lausanne
CNR—National Research Council (2004) Italian advisory committee on technical recommendations for construction. Istruzioni per la progettazione, l’esecuzione ed il controllo di interventi di consolidamento statico mediante l’utilizzo di compositi fibrorinforzati - Materiali, strutture di c.a. e di c.a.p., strutture murarie (CNR-DT 200/2004). Rome
Malhotra M, Carino NJ (eds) (1991) Handbook on nondestructive testing of concrete. CRC Press
Balageas DL, Krapez JC, Cielo P (1986) Pulsed photothermal modelling of layered materials. J Appl Phys 59:348–357
Maldague X (2001) Theory and practice of infrared technology for nondestructive testing. John Wiley & Sons, New York
ASNT (2001) Nondestructive testing handbook. In: Moore PO (ed) Infrared and thermal testing, vol. 3, 3rd edn. American Society of Nondestructive Testing, Columbus
Starnes MA, Carino NJ, Kausel EA (2003) Preliminary thermography studies for quality control of concrete structures strengthened with FRP composites. ASCE J Mater Civil Eng 15(3):266–273
Bison PG, Grinzato E, Marinetti S, Braggiotti A (1998) Fresco thermographic inspection by convective heating technique. In: Thompson DO, Chimenti DE (eds) Review of progress in quantitative non-destructive evaluation, vol 17. Plenum Press, New York, pp 1769–1776
Grinzato E, Luprano VAM, Marinetti S, Bison PG, Trentin R, Tundo A, Tatì A (2006) Thermal NdE of FRP applied to civil structures. Paper presented at QIRT 2006, Padova, 28–30 July 2006
Luprano VAM, Tundo A, Tatì A, Grinzato E, Marinetti S, Bison PG (2006) Non destructive defect characterization in civil structures reinforced by means of FRP. Paper presented at ECNDT 2006, 9th European conference on non-destructive testing, Berlin, 25–29 September 2006
Grinzato E, Marinetti S, Bison PG (2005) Controllo termografico di strutture edili fibrorinforzate. Paper presented at Conferenza Nazionale AIPnD, Milan, October 2005
Marinetti S, Grinzato E, Bison PG, Bozzi E, Chimenti M, Pieri G, Salvetti O (2005) Analysis of IR thermographic sequences by PCA. J Infrared Phys Technol Elsevier 46:85–91
Brown JR, Hamilton III HR (2004) NDE of fiber-reinforced polymer composites bonded to concrete using IR thermography. Spie 5405, Thermosense XXVI, pp 414–424
Galietti U, Luprano V, Nenna S, Spagnolo L, Tundo A (2005) Non destructive defect characterization of concrete structures reinforced by means of FRP. Paper presented at AITA, 8 September 2005
Maldague X, Marinetti S (1996) Pulse phase infrared thermography. J Appl Phys 79(5):2694–2698
Vavilov V, Bison PG, Bressan C, Grinzato E, Marinetti S (1992) Some new ideas in dynamic thermal tomography. QIRT 92, Editions Europeennes Thermique et Industrie, pp 259–265
Liu C, Czuban L, Bison PG, Grinzato E, Marinetti S, Maldague X (2006) Complex-shaped object: effects on phase and amplitude images in infrared thermography for NDT. Paper presented at 12th APCNDT, Auckland, 5–10 November 2006
Almond DP, Lau SK (1994) Defect sizing by transient thermography. I: an analytical treatment. J Appl Phys 27:1063–1069
Acknowledgments
The authors wish thank the companies Maxfor srl of Quarto d’Altino (Venice) and Spagnolo Prefabbricati of Caselle d’Altivole (Treviso) for supplying materials and preparing the specimens used in this experimental research. Students R. Trentin, E. Bordignon and M. Muner are especially thanked for their help during experimental work and analysis.
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Valluzzi, M.R., Grinzato, E., Pellegrino, C. et al. IR thermography for interface analysis of FRP laminates externally bonded to RC beams. Mater Struct 42, 25–34 (2009). https://doi.org/10.1617/s11527-008-9364-z
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DOI: https://doi.org/10.1617/s11527-008-9364-z