Title:
Effect of Surface Characteristics of FRP Bars on Bond Behavior in Concrete
Author(s):
Sándor Sólyom, Matteo Di Benedetti and György L. Balázs
Publication:
Symposium Paper
Volume:
327
Issue:
Appears on pages(s):
41.1-41.20
Keywords:
bar diameter; bond; bond strength; concrete strength; FRP; slip; surface profile; test type
DOI:
10.14359/51713362
Date:
11/1/2018
Abstract:
This paper presents an extensive experimental study of the effect that the surface profile has on the bond behavior of FRP bars in concrete. Studied parameters include: concrete strength (~35 MPa (5075 psi) and ~66 MPa (9570 psi)), test type (pull-out, direct tension pull-out and beam pull-out) and surface profile of the FRP bar (helically wrapped, indented, two types of sand coated and two types of helically wrapped and sand coated. For comparison, ribbed steel bars were also used). It was found that the bond strength can vary considerably when different finishing of the same surface profile type are used (e.g., fine and rough sand coating) and that the concrete strength does influence the bond strength even if it is higher than the limit (~30 MPa (4350 psi)) stated in literature. Furthermore, the bond strength results of all FRP bars were consistently higher than those of steel bars. The highest slip value to reach the bond strength was observed for helically wrapped FRP bars, and the lowest for sand coated bars. Finally, the test setup was found to affect the bond strength, while no significant effect of bar diameter was observed in the results.
Related References:
ACI Committee 440, 2015. Guide for the Design and Construction of Structural Concrete Reinforced with FRP Bars (ACI 440.1R-15), Farmington Hills, MI.
AL-Mahmoud, F. et al., 2007. Effect of surface pre-conditioning on bond of carbon fibre reinforced polymer rods to concrete. Cement and Concrete Composites, 29(9), pp.677–689.
Anon, 1982. RILEM RC 5 Bond test for reinforcement steel. 1. Beam test.
Anon, 1983. RILEM RC 6 Bond test for reinforcement steel. 2. Pull-out test.
Arias, J.P.M., Vazquez, A. & Escobar, M.M., 2012. Use of sand coating to improve bonding between GFRP bars and concrete. Journal of Composite Materials, 46(February), pp.2271–2278.
Ayudhya, B.I.N. & Ungkoon, Y., 2010. Bond Strength of Fiber Reinforced Polymer ( FRP ) Bars in Autoclaved Aerated Concrete ( AAC ). In The 5th International Conference on FRP Composites in Civil Engineering September 27-29, 2010, Beijing, China. Bejing, China, pp. 1–4.
Baena, M. et al., 2009. Experimental study of bond behaviour between concrete and FRP bars using a pull-out test. Composites Part B: Engineering, 40(8), pp.784–797. Available at: http://dx.doi.org/10.1016/j.compositesb.2009.07.003.
Bakis, C.E. et al., 1998. Analysis of bonding mechanisms of smooth and lugged frp rods embedded in concrete. Composites Science and Technology, 58(8), pp.1307–1319.
CAN/CSA-S6-06, 2006. Canadian Highway Bridge Design Code, Mississauga, Ontario, Canada.
CSA-S806-12, 2012. Design and construction of building structures with fibre-reinforced polymers, Mississauga, Ontario, Canada: Canadian Standards Association.
EN12390-3:2009, 2009. Testing hardened concrete. Part 3: Compressive strength of test specimens.
EN12390-6:2010, 2010. Testing hardened concrete. Part 6: Tensile splitting strength of test specimens.
EN 12350-5:2009, 2009. Testing fresh concrete: Flow table test.
Focacci, F., Nanni, A. & Bakis, C.E., 2000. Local bond-slip relationship for FRP reinforcement in concrete. Journal of Composites for Construction, (February), pp.24–31.
Gudonis, E. et al., 2014. Mechanical Properties of the Bond Between GFRP Reinforcing Bars and Concrete. Mechanics of Composite Materials, 50(4), pp.457–466. Available at: http://link.springer.com/10.1007/s11029-014-9432-0.
Hao, Q. et al., 2009. Bond strength of glass fiber reinforced polymer ribbed rebars in normal strength concrete. Construction and Building Materials, 23(2), pp.865–871. Available at: http://dx.doi.org/10.1016/j.conbuildmat.2008.04.011.
Japanese Society of Civil Engineers (JSCE), 1997. Recommendations for design and construction for concrete structures using continuous fibre reinforcing materials. Concrete Engineering Series, (23).
Lee, J.Y. et al., 2008. Interfacial bond strength of glass fiber reinforced polymer bars in high-strength concrete. Composites Part B: Engineering, 39(2), pp.258–270.
Lin, X. & Zhang, Y.X., 2013. Bond-slip behaviour of FRP-reinforced concrete beams. Construction and Building Materials, 44, pp.110–117. Available at: http://dx.doi.org/10.1016/j.conbuildmat.2013.03.023.
Mazaheripour, H. et al., 2013. Experimental study on bond performance of GFRP bars in self-compacting steel fiber reinforced concrete. Composite Structures, 95, pp.202–212. Available at: http://dx.doi.org/10.1016/j.compstruct.2012.07.009.
Muñoz, M.B., 2010. Study of bond behaviour between FRP reinforcement and concrete. University of Girona. Available at: http://www.tdx.cat/handle/10803/7771.
Nanni, A. et al., 1995. Bond of FRP reinforcement to concrete - Experimental results. In L. Taerwe, ed. Non-metalic (FRP) reinforcement for concrete structurestalic (FRP) reinforcement for concrete structures. London: E & FN Spon, 2-6 Boundaty Row, pp. 135–145.
Nanni, A. et al., 2016. Concrete and Composites Pedestrian Bridge. Innovative use of various types of FRP reinforcement at the University of Miami. , (November), pp.57–63.
Pecce, M. et al., 2001. Experimental and analytical evaluation of bond properties of GFRP bars. Journal of Materials in Civil Engineering, (July/August), pp.282–290.
Pour, S.M., Alam, M.S. & Milani, A.S., 2016. Improved Bond Equations for Fiber-Reinforced Polymer Bars in Concrete. materials, 9(737), pp.1–14.
Sayed Ahmad, F., Foret, G. & Le Roy, R., 2011. Bond between carbon fibre-reinforced polymer (CFRP) bars and ultra high performance fibre reinforced concrete (UHPFRC): Experimental study. Construction and Building Materials, 25(2), pp.479–485. Available at: http://dx.doi.org/10.1016/j.conbuildmat.2010.02.006.
Sólyom, S. & Balázs, G.L., 2016. Influence of FRC on bond characteristics of FRP reinforcement. In 11th fib International PhD Symposium in Civil Engineering. Tokyo, J, pp. 271–278.
Sólyom, S. & Balázs, G.L., 2017. Non-metallic reinforcements with different moduli of elasticity and surfaces for concrete structures. In CCC2017 - The 12th Central European Congress on Concrete Engineering. Tokaj, pp. 1–8.
Tasevski, D., 2013. Effect of surface treatment on the bond behavior of Fiber Reinforced Polymer (FRP) reinforcement and concrete. Lafarge Research Center / Laboratoire Navier / ENPC.
Tastani, S.P. & Pantazopoulou, S.J., 2007. Design Values of Bond – Slip Law for Frp Bars. In FRPRCS-8. Patras, pp. 1–10.
Tighiouart, B., Benmokrane, B. & Gao, D., 1998. Investigation of bond in concrete member with fibre reinforced polymer (FRP) bars. Construction and Building Materials, 12(8), pp.453–462.
Vint, L.M., 2012. Investigation of Bond Properties of Glass Fibre Reinforced Polymer (GFRP) Bars in Concrete under Direct Tension. University of Toronto. Available at: https://tspace.library.utoronto.ca/handle/1807/33573.
Wang, H. & Belarbi, A., 2010. Static and Fatigue Bond Characteristics of FRP Rebars Embedded in Fiber-reinforced Concrete. Journal of Composite Materials, 44(13), pp.1605–1622. Available at: http://jcm.sagepub.com/cgi/doi/10.1177/0021998309355845.
Yan, F., Lin, Z. & Yang, M., 2016. Bond mechanism and bond strength of GFRP bars to concrete: A review. Composites Part B: Engineering, 98, pp.56–69. Available at: http://linkinghub.elsevier.com/retrieve/pii/S1359836816305200.