Effect of Temperature on Bond Behavior of Externally Bonded FRP Laminates with Mechanical End Anchorage
Publication: Journal of Composites for Construction
Volume 23, Issue 5
Abstract
The use of mechanical anchorage systems can delay or prevent premature failure of RC structures with externally bonded fiber-reinforced polymer (EB-FRP) laminates. This work reports the results of an experimental program aimed at studying the bond behavior of a metallic anchorage plate, typically used for prestressed EB-FRP systems. The overall experimental program comprised 17 concrete prisms with carbon fiber–reinforced polymer (CFRP) laminates externally bonded to the concrete with mechanical anchorage at the end and to which different levels of normal stress were applied. Direct shear tests were carried out using two configurations: (1) steady-state tests, in which the laminate was pulled out from the block with increasing force and at constant temperature (20°C, 60°C, and 80°C); and (2) transient tests, in which the laminate was pulled out with constant force (0.36%, 0.45% and 0.54% of strain) and the temperature was gradually increased. Experimental results showed that the ultimate capacity of the mechanical anchorage can decrease by 44%–59% depending on the temperature and level of normal stress.
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Acknowledgments
This work was supported by FEDER funds through the Operational Program for Competitiveness Factors—COMPETE and National Funds through the Portuguese Foundation for Science and Technology (FCT) under Project No. FRPLongDur POCI-01-0145-FEDER-016900 (FCT PTDC/ECM-EST/1282/2014) and partly financed by Project POCI-01-0145-FEDER-007633. The first author acknowledges Grant No. SFRH/BD/98309/2013 provided by FCT. The second author acknowledges the Spanish Government (Ministerio de Educación, Cultura y Deporte) for the José Castillejo grant ref. CAS16/00288. Finally, the authors also thank all the companies that supported and contributed to the development of this study, including S&P Clever Reinforcement Ibérica for providing the laminates, epoxy adhesive, and metallic anchorage plates; Hilti Portugal-Produtos e Serviços for providing the chemical bond agent to fix the anchor bolts; and Tecnipor–Gomes & Taveira for producing the concrete blocks.
References
ACI (American Concrete Institute). 2008. Guide for the design and construction of externally bonded FRP systems for strengthening existing structures. ACI 440.2R-08. Farmington Hills, MI: ACI.
Aslam, M., P. Shafigh, M. Z. Jumaat, and S. N. R. Shah. 2015. “Strengthening of RC beams using prestressed fiber reinforced polymers: A review.” Constr. Build. Mater. 82 (May): 235–256. https://doi.org/10.1016/j.conbuildmat.2015.02.051.
Barris, C., L. Correia, and J. Sena-Cruz. 2018. “Experimental study on the bond behaviour of a transversely compressed mechanical anchorage system for externally bonded reinforcement.” Compos. Struct. 200 (Sep): 217–228. https://doi.org/10.1016/j.compstruct.2018.05.084.
Biscaia, H. C., C. Chastre, and M. A. G. Silva. 2015. “Bond-slip model for FRP-to-concrete bonded joints under external compression.” Composites Part B 80: 246–259. https://doi.org/10.1016/j.compositesb.2015.06.004.
Biscaia, H. C., M. A. G. Silva, and C. Chastre. 2016. “Influence of external compressive stresses on the performance of GFRP-to-concrete interfaces subjected to aggressive environments: An experimental analysis.” J. Compos. Constr. 20 (2): 04015044. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000600.
Blontrock, H. 2003. “Analysis and modeling of the fire resistance of concrete elements with externally bonded FRP reinforcement.” Ph.D. thesis, Faculteit Toegepaste Wetenschappen, Vakgroep Bouwkundige constructies, Ghent Univ.
Cai, Z. H. 2008. “Research on bond property of FRP-to-concrete interface under elevated temperatures.” Master’s thesis, College of Civil Engineering, Tongji Univ.
Ceroni, F., and M. Pecce. 2010. “Evaluation of bond strength in concrete elements externally reinforced with CFRP sheets and anchoring devices.” J. Compos. Constr. 14 (5): 521–530. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000118.
CNR (Advisory Committee on Technical Recommendations for Construction). 2013. Guide for the design and construction of externally bonded FRP systems for strengthening existing structures. Rome: CNR.
Correia, L., J. Sena-Cruz, J. Michels, P. M. França, E. Pereira, and G. Escusa. 2017. “Durability of RC slabs strengthened with prestressed CFRP laminate strips under different environmental and loading conditions.” Composites Part B 125: 71–88. https://doi.org/10.1016/j.compositesb.2017.05.047.
Correia, L., T. Teixeira, J. Michels, J. A. P. P. Almeida, and J. Sena-Cruz. 2015. “Flexural behaviour of RC slabs strengthened with prestressed CFRP strips using different anchorage systems.” Composites Part B 81 (Nov): 158–170. https://doi.org/10.1016/j.compositesb.2015.07.011.
Del Prete, I., A. Bilotta, and E. Nigro. 2015. “Performances at high temperature of RC bridge decks strengthened with EBR-FRP.” Composites Part B 68 (Jan): 27–37. https://doi.org/10.1016/j.compositesb.2014.08.011.
Firmo, J. P., J. R. Correia, and P. M. França. 2012. “Fire behaviour of reinforced concrete beams strengthened with CFRP laminates: Protection systems with insulation of the anchorage zones.” Composites Part B 43 (3): 1545–1556. https://doi.org/10.1016/j.compositesb.2011.09.002.
Firmo, J. P., J. R. Correia, D. Pitta, C. Tiago, and M. R. T. Arruda. 2015. “Experimental characterization of the bond between externally bonded reinforcement (EBR) CFRP strips and concrete at elevated temperatures.” Cem. Concr. Compos. 60: 44–54. https://doi.org/10.1016/j.cemconcomp.2015.02.008.
IPQ (Instituto Portugues da Qualidade). 2011. Testing hardened concrete, Part 3: Compressive strength of test specimens. NP EN 12390-3:2011. Caparica: IPQ.
ISO. 1997. Plastics—Determination of tensile properties—Part 5: Test conditions for unidirectional fibre-reinforced plastic composites. ISO-527-5. London: British Standards Institution.
Kalfat, R., and S. T. Smith. 2013. “Anchorage devices used to improve the performance of reinforced concrete beams retrofitted with FRP composites: State-of-the-art review.” J. Compos. Constr. 17 (Feb): 14–33. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000276.
Klamer, E. 2009. Influence of temperature on concrete beams strengthened in flexure with CFRP. Eindhoven, Netherlands: Eindhoven Univ. of Technology.
Kotynia, R., R. Walendziak, I. Stoecklin, and U. Meier. 2010. “RC slabs strengthened with prestressed and gradually anchored CFRP strips under monotonic and cyclic loading.” J. Compos. Constr. 15 (2): 168–180. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000081.
Krzywoń, R. 2017. “Behavior of EBR FRP strengthened beams exposed to elevated temperature.” Procedia Eng. 193: 297–304. https://doi.org/10.1016/j.proeng.2017.06.217.
Leone, M., S. Matthys, and M. A. Aiello. 2009. “Effect of elevated service temperature on bond between FRP EBR systems and concrete.” Composites Part B 40 (1): 85–93. https://doi.org/10.1016/j.compositesb.2008.06.004.
LNEC. 1993. Concrete: Determination of the elasticity Young’s modulus under compression. Portugal: LNEC.
Michels, J., J. Barros, I. Costa, J. Sena-Cruz, C. Czaderski, G. Giacomin, R. Kotynia, J. Lees, C. Pellegrino, and E. Zile. 2016a. “Prestressed FRP systems.” In Design procedures for the use of composites in strengthening of reinforced concrete structures: State-of-the-art report of the RILEM technical committee 234-DUC, edited by C. Pellegrino and J. Sena-Cruz, 263–301. Dordrecht, Netherlands: Springer.
Michels, J., J. Sena-Cruz, R. Christen, C. Czaderski, and M. Motavalli. 2016b. “Mechanical performance of cold-curing epoxy adhesives after different mixing and curing procedures.” Composites Part B 98 (Aug): 434–443. https://doi.org/10.1016/j.compositesb.2016.05.054.
Michels, J., J. J. Sena-Cruz, C. Czaderski, and M. Motavalli. 2013. “Structural strengthening with prestressed CFRP strips with gradient anchorage.” J. Compos. Constr. 17 (5): 651–661. https://doi.org/10.1061/(ASCE)CC.1943-5614.0000372.
Pellegrino, C., and J. Sena-Cruz. 2016. Design procedures for the use of composites in strengthening of reinforced concrete structures: State-of-the-art report of the RILEM technical committee 234-DUC. Dordrecht, Netherlands: Springer.
Sena-Cruz, J., J. Michels, Y. E. Harmanci, and L. Correia. 2015. “Flexural strengthening of RC slabs with prestressed CFRP strips using different anchorage systems.” Polymers 7 (10): 2100–2118. https://doi.org/10.3390/polym7101502.
Silva, P., P. Fernandesa, J. Sena-Cruz, J. Xavier, F. Castro, D. Soares, and V. Carneiro. 2016. “Effects of different environmental conditions on the mechanical characteristics of a structural epoxy.” Composites Part B 88: 55–63. https://doi.org/10.1016/j.compositesb.2015.10.036.
S&P. 2010. Pre-stressed S&P Laminates CFK. Manual for applicators. Seewen, Switzerland: S&P.
S&P. 2013. Resin 220 epoxy adhesive, technical datasheet. Seewen, Switzerland: S&P.
S&P. 2014a. CFRP laminates, technical datasheet. Seewen, Switzerland: S&P.
S&P. 2014b. “Reinforcement—Underground Garage, Coop, Kasparstrasse—Bern, Switzerland.” Accessed January 31, 2018. https://www.sp-reinforcement.eu/en-CH/projects/reinforcement-underground-garage-coop-kasparstrasse-bern-switzerland.
Wu, Z. S., K. Iwashita, S. Yagashiro, T. Ishikawa, and Y. Hamaguchi. 2005. “Temperature effect on bonding and debonding behavior between FRP sheets and concrete” J. Soc. Mater. Sci. 54 (5): 474–480. https://doi.org/10.2472/jsms.54.474.
Yang, D.-S., S.-K. Park, and K. W. Neale. 2009. “Flexural behaviour of reinforced concrete beams strengthened with prestressed carbon composites.” Compos. Struct. 88 (4): 497–508. https://doi.org/10.1016/j.compstruct.2008.05.016.
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Published In
Journal of Composites for Construction
Volume 23 • Issue 5 • October 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Feb 19, 2018
Accepted: Feb 4, 2019
Published online: Jul 18, 2019
Published in print: Oct 1, 2019
Discussion open until: Dec 18, 2019
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