Bond Properties of GFRP Laminate with Heat-Damaged Concrete
Publication: Journal of Composites for Construction
Volume 20, Issue 2
Abstract
Concrete, when exposed to elevated temperatures, undergoes deterioration and loses much of its strength. The strengthening of heat-damaged concrete is possible with the help of external reinforcing materials such as fiber-reinforced polymers (FRPs). The strength of FRP-strengthened flexural concrete members depends on the bond between the FRP and the concrete. The purpose of this experimental study was to investigate the behavior of the bond between the glass fiber-reinforced polymer (GFRP) laminate and the heated concrete using a single-shear test (SST). The specimens were initially heated to temperatures of 200, 400, 600, and 800°C. The heat-damaged specimens were subsequently bonded with FRP sheets with various bond lengths (100, 150, and 200 mm). The test variables were bond length and elevated temperatures. The results show that bond strength increased with increasing bond length and noticeably decreased as temperatures exceeded 400°C. The thickness of the delaminated concrete layer with GFRP composite was less than 4 mm for the specimens subjected to temperatures less than 400°C. However, the thickness of the delaminated concrete ranged 4–25 mm in 600 and 800°C heat-damaged specimens. The ultimate bond stress was influenced by the bond length and increased as the bond length decreased. A model is proposed to estimate the bond strength between GFRP laminate and heated concrete.
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Acknowledgments
The authors express their sincere gratitude to the Structural Engineering Laboratory of the Department of Civil Engineering at the Indian Institute of Technology Roorkee, (India) for the help provided during the present experimental study.
References
ACI (American Concrete Institute). (2008). “Guide for the design and construction of externally-bonded FRP systems for strengthening concrete structures.” ACI 440.2R-08, Farmington Hills, MI.
Bilotta, A., Ludovico, M. D., Manfredi, G., and Nigro, E. (2011). “FRP-to-concrete interface debonding: Experimental calibration of a capacity model.” Composites Part B, 42(6), 1539–1553.
Bureau of Indian Standards. (2009). “Recommended guidelines for concrete mix design.” IS 10262:2009, New Delhi, India, 21.
Chajes, M. J., Finch, W. W., Jr., Januszka, T. F., and Thomson, T. A., Jr. (1996). “Bond and force transfer of composite material plates bonded to concrete.” ACI Struct. J., 93(2), 295–303.
Chang, Y. F., Chen, Y. H., Sheu, M. S., and Yao, G. C. (2006). “Residual stress-strain relationship for concrete after exposure to high temperatures.” Cem. Concr. Res., 36(10), 1999–2005.
Chen, J. F., and Teng, J. G. (2001). “Anchorage strength models for FRP and steel plates bonded to concrete.” J. Struct. Eng., 784–791.
Danie Roy, A. B., Sharma, U. K., and Bhargava, P. (2014). “Strengthening of heat damaged reinforced concrete short columns.” J. Struct. Fire Eng., 5(4), 381–398.
De Lorenzis, L., Miller, B., and Nanni, A. (2001). “Bond of fiber reinforced polymer laminates to concrete.” ACI Mater. J., 98(3), 256–264.
Haddad, R. H., Al-Rousan, R., and Almasry, A. (2013). “Bond-slip behavior between carbon fiber reinforced polymer sheets and heat-damaged concrete.” Composites Part B, 45(1), 1049–1060.
Haddad, R. H., Shannag, M. J., and Hamad, R. J. (2011). “Repair of heat-damaged reinforced concrete T-beams using FRC jackets.” Mag. Concr. Res., 59(3), 223–231.
Klamer, E. (2006). “The influence of temperature on concrete structures strengthened with externally bonded CFRP.”, Eindhoven Univ. of Technology, Eindhoven, Netherlands.
Leone, M., Matthys, S., and Aiello, M. A. (2009). “Effect of elevated service temperature on bond between FRP EBR systems and concrete.” Composites Part B, 40(1), 85–93.
Lu, X. Z., Teng, J. G., Ye, L. P., and Jiang, J. J. (2005). “Bond-slip models for FRP sheets/plates bonded to concrete.” Eng. Struct., 27(6), 920–937.
Mazzotti, C., Savola, M., and Ferracuti, B. (2008). “An experimental study on delamination of FRP plates bonded to concrete.” Constr. Build. Mater., 22(7), 1409–1421.
Nakaba, K., Kanakubo, T., Furuta, T., and Yoshizawa, H. (2001). “Bond behavior between fiber-reinforced polymer laminates and concrete.” ACI Struct. J., 98(3), 359–367.
Peng, G. F., Bian, S. H., Zhao, Z. L., and Yl, Q. X. (2006). “Effect of cooling regimes on mechanical properties of fibre-toughened high-performance concrete.” Key Eng. Mater., 302–303, 603–609.
Teng, J. G., Chen, J. F, Smith, S. T, and Lam, L. (2002). FRP-strengthened RC structures, Wiley, Chichester, U.K.
Teng, J. G., Smith, S. T., Yao, J., and Chen, J. F. (2003). “Intermediate crack- induced debonding in RC beams and slabs.” Constr. Build. Mater., 17(6–7), 447–462.
Woo, S. K., and Yen, L. (2010). “Experimental study on Interfacial behavior of CFRP–bonded concrete.” KSCE J. Civ. Eng., 14(3), 385–393.
Wu, B., Su, X. P., Li, H., and Yuan, J. (2002). “Effects of high temperature on residual mechanical properties of confined and unconfined high strength concrete.” ACI Mater. J., 99(4), 399–407.
Xiao, J., Li, J., and Zha, Q. (2004). “Experimental study on bond behaviour between FRP and concrete.” Constr. Build. Mater., 18(10), 745–752.
Yao, J., Ting, J. G., and Chen, J. F. (2005). “Experimental study on FRP-to-concrete bonded joints.” Composites Part B, 36(2), 99–113.
Yaqub, M., and Bailey, C. G. (2011). “Cross sectional shape effects on the performance of post-heated reinforced concrete columns wrapped with FRP composites.” Compos. Struct., 93(3), 1103–1117.
Yaqub, M., Bailey, C. G., Nedwell, P., Khan, Q. U. Z., and Javed, I. (2013). “Strength and stiffness of post-heated columns repaired with ferrocement and fibre reinforced polymer jackets.” Composites Part B, 44(1), 200–211.
Yuan, H., Teng, J. G., Seracino, R., Wu, Z. S., and Yao, J. (2004). “Full-range behavior of FRP-to-concrete bonded joints.” Eng. Struct., 26(5), 553–565.
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© 2015 American Society of Civil Engineers.
History
Received: Jan 13, 2015
Accepted: Jul 14, 2015
Published online: Sep 10, 2015
Discussion open until: Feb 10, 2016
Published in print: Apr 1, 2016
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