Characterization of Flaws Embedded in Externally Bonded CFRP on Concrete Beams by Infrared Thermography and Shearography
Source abstract
Abstract
Carbon fiber-reinforced polymer (CFRP) has become an important material to rehabilitate deteriorating concrete structures. The quality of the bond between the externally-bonded CFRP and concrete elements is crucial to durability and structural integrity of the rehabilitated concrete structure. However, flaws between CFRP and concrete interfaces can reduce the effective contact area significantly and therefore, the overall bond strength at these interfaces. Such flaws are not readily noticed by naked eyes, but can be detected and quantified non-destructively and effectively by using full-field and non-contact infrared thermography (IRT) and laser shearography. Flaw and sound areas presented within the FRP-concrete interfaces manifest very different thermal decay and mechanical fingerprints. In this paper, we report a study which tested, with IRT and shearography, the sizes and shapes of 17 round-shaped and artificial flaws embedded in 6 CFRP-concrete specimens; and then compared the results with the actual flaw sizes and shapes. In general, the results show that IRT underestimated the actual flaw sizes by 6.1% on average, whilst shearography overestimated the actual flaw sizes by 9.4% on average. These results demonstrated that both IRT and shearography are promising non-destructive evaluation techniques that can be used to define flaw boundaries and determine flaw sizes within the CFRP-concrete composites.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Thermography and Photoacoustic Techniques · Fire effects on concrete materials · Structural Health Monitoring Techniques
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References (22)
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1. ACI Committee: Guide test methods for fiber-reinforced polymers (FRPs) for reinforcing or strengthening concrete, 2004
2. ASTM D3039/D3039M: Standard test method for tensile properties of polymer matrix composite materials. West Conshohocken, PA (1995)
3. Chen, J.F., Teng, J.G.: Shear capacity of FRP-strengthened RC beams: FRP debonding. Constr. Build. Mater. 17(1), 27–41 (2003)10.1016/S0950-0618(02)00091-0 ↗
4. Creath, K.: Phase-measurement techniques for nondestructive testing. In: Proceedings of SEM Conference on Hologram Interferometry and Speckle Metrology, Baltimore, Maryland, pp. 473–478, Nov. 5–8 (1990)
5. Fomitchov, P., Wang, L.S., Krishnaswamy, S.: Advanced image-processing techniques for automatic nondestructive evaluation of adhesively-bonded structures using speckle interferometry. J. Nondestr. Evaluation 16(4), 215–227 (1997)10.1023/A:1021848031529 ↗
6. Hung, Y.Y., Ho, H.P.: Shearography: An optical measurement technique and applications. Mater. Sci. Eng. R 49, 61–87 (2005)10.1016/j.mser.2005.04.001 ↗
7. Hung, Y.Y.: A speckle-shearing interferometer: a tool for measuring derivatives of surface displacement. Opt. Commun. 11(2), 132–135 (1974)10.1016/0030-4018(74)90200-4 ↗
8. Hung, Y.Y., Chen, Y.S., Ng, S.P., Shepard, S.M., Hou, Y., Lhota, J.R.: Review and comparison of shearography and pulsed thermography for adhesive bond evaluation. Opt. Eng. 46(5), 051007 (2007)10.1117/1.2741277 ↗
9. Ibarra-Castanedo, C., Maldague, X.: Defect depth retrieval from pulsed phase thermographic data on Plexiglas and aluminium samples. Proc. SPIE 5405, 348–355 (2004)10.1117/12.540855 ↗
10. Karbhari, V.M., Seible, F.: Design consideration for the use of fiber reinforced polymeric composites in the rehabilitation of concrete structures, NISTIR 6288. In: Duthinh, D. (ed.) Proc. NIST Workshop on Standards Development for the Use of Fiber Reinforced Polymers for the Rehabilitation of Concrete and Masonry Structures, Gaitherburg, MD (1999)
11. Krapez, J.C., Cielo, P.: Thermographic nondestructive evaluation: data inversion procedures part I: 1D analysis. Res. Nondestr. Evaluation 3(2), 81–100 (1991)10.1080/09349849109409504 ↗
12. Lai, W.L., Kou, S.C., Poon, C.S.: Flaw characterization within the interface of the externally bonded CFRP-concrete composites using infrared thermography. Cem. Concr. Compos. (under review)
13. Lam, L., Teng, J.G: Ultimate condition of fiber reinforced polymer-confined concrete. ASCE J. Compos. Constr. 8(6), 539–548 (2004)10.1061/(ASCE)1090-0268(2004)8:6(539) ↗
14. Lau, S.K., Almond, D.P., Patel, M., Corbett, J., Quigley, M.B.C.: Analysis of transient thermal inspection. In: Letthington, A.H. (ed.) Infrared Technology and Applications. Proc. SPIE, 1990, 1320, 178–185. Maldague (2001)
15. Lienhard, J.: A Heat Transfer Handbook. Prentice Hall, Englewood Cliffs (1981)
16. Li, X.D., Liu, X.F., Wang, K.: Quantitative detection of the defects in thin-walled pressure vessels with holography and shearing speckle interferometry. J. Nondestr. Evaluation 21(3), 85–94 (2002)10.1023/A:1022532705891 ↗
17. Maldague, X.P.V.: Theory and Practice of Infrared Technology for Nondestructive Testing. Wiley, New York (2001)
18. Noda, N., Hetnarski, R.B., Tanigawa, Y.: Thermal Stresses, 2nd edn. Taylor & Francis, New York (2003)
19. Poon, C.S., Lai, W.L., Kou, S.C., Tsang, W.F., Lai, C.C.: A quantitative study on bond behavior between fiber-reinforced polymer (FRP) and concrete interface using infra-red thermography (IRT). The First Asia-Pacific Conference on FRP in Structures, 12–14 December 2007, Hong Kong, pp. 717–721 (2007)
20. Starnes, M.A., Carino, N.J., Kausel, E.A.: Preliminary thermography studies for quality control of concrete structures strengthed with fiber-reinforced polymer composite. J. Mater. Civil Eng. 15(3) (2003)10.1061/(ASCE)0899-1561(2003)15:3(266) ↗
21. Teng, J.G., Lam, L., Chen, J.F.: Shear strengthening of RC beams using FRP composites. Prog. Struct. Eng. Mater. 6, 173–184 (2004)10.1002/pse.179 ↗
22. Watson, R.: Wrapping it: fiber reinforced polymers—a cost-effective solution for extending the life of our aging infrastructure. ASTM Standardization News, Feb. 22–25 (2000)