Exploratory Study on Bond Behavior of Textured Epoxy-Coated Reinforcing Bars
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 8
Abstract
Research and experience have both shown that epoxy-coated reinforcement, the use of which is mandated by most state departments of transportation for bridge decks, increases cracking. Although the epoxy coating protects the steel from corrosion, bond strength is compromised and the increased cracking exacerbates durability issues in concrete. As a means to improve bonds and reduce the formation of cracks, the Illinois Department of Transportation (IDOT) proposed texturizing the surface of epoxy-coated bars. IDOT developed a prototype textured epoxy coating, and this paper details a preliminary study on the bond strength of reinforcing bars with the new coating. Direct pull-out and beam specimens are tested to compare the bond characteristics of uncoated, standard epoxy-coated, and textured epoxy-coated (TEC) No. 5 (15.9-mm diameter) and No. 8 (25.4-mm diameter) reinforcing bars. Bars with the textured epoxy coating showed good force-slip behavior comparable with black steel initially, but a rapid degradation in slip resistance was observed. In flexure, the TEC reinforcement demonstrated significantly higher slip resistance and resistance to crack widening compared with the conventional epoxy-coated bar. Overall, the added frictional resistance of the textured epoxy-coating showed promise. However, further research is needed to optimize the coating and characterize its behavior.
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Acknowledgments
This work was supported by the Illinois Center for Transportation and the Illinois Department of Transportation (ICT/IDOT) under Project No. R27-SP35.
References
AASHTO. 2017. LRFD bridge design specifications. 8th ed. Washington, DC: AASHTO.
ACI (American Concrete Institute). 2014. Building code requirements for structural concrete and commentary. ACI 318/ACI 318R. Farmington Hills, MI: ACI.
Alagusundaramoorthy, P., I. E. Harik, and C. C. Choo. 2006. “Structural behavior of FRP composite bridge deck panels.” J. Bridge Eng. 11 (4): 384–393. https://doi.org/10.1061/(ASCE)1084-0702(2006)11:4(384).
Andrawes, B., M. Shin, and N. Wierschem. 2009. “Active confinement of reinforced concrete bridge columns using shape memory alloys.” J. Bridge Eng. 15 (1): 81–89. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000038.
ASCE. 2017. 2017 infrastructure report card. Reston, VA: ASCE.
ASTM. 2017a. Standard specification for epoxy-coated steel reinforcing bars. ASTM A775/A775M. West Conshohocken, PA: ASTM.
ASTM. 2017b. Standard test method for measurement of surface roughness of abrasive blast cleaned metal surfaces using a portable stylus instrument. ASTM D7127-13. West Conshohocken, PA: ASTM.
Benmokrane, B., P. Wang, T. M. Ton-That, H. Rahman, and J. F. Robert. 2002. “Durability of glass fiber-reinforced polymer reinforcing bars in concrete environment.” J. Compos. Constr. 6 (3): 143–153. https://doi.org/10.1061/(ASCE)1090-0268(2002)6:3(143).
Berg, A. C., L. C. Bank, M. G. Oliva, and J. S. Russell. 2006. “Construction and cost analysis of an FRP reinforced concrete bridge deck.” Constr. Build. Mater. 20 (8): 515–526. https://doi.org/10.1016/j.conbuildmat.2005.02.007.
Cairns, J., and R. Abdullah. 1994. “Fundamental tests on the effect of an epoxy coating on bond strength.” ACI Mater. J. 91 (4): 331–338.
Cairns, J., and G. A. Plizzari. 2003. “Towards a harmonised European bond test.” Mater. Struct. 36 (8): 498–506. https://doi.org/10.1007/BF02480826.
Choi, O., H. Hadje-Ghaffari, D. Darwin, and S. L. McCabe. 1991. “Bond of epoxy-coated reinforcement: Bar parameters.” ACI Mater. J. 88 (26): 207–217.
Cleary, D. B., and J. A. Ramirez. 1991. “Bond strength of epoxy-coated reinforcement.” ACI Mater. J. 88 (2): 146–149.
Coronelli, D., and P. Gambarova. 2004. “Structural assessment of corroded reinforced concrete beams: Modeling guidelines.” J. Struct. Eng. 130 (8): 1214–1224. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:8(1214).
Harajli, M. H., B. S. Hamad, and A. A. Rteil. 2004. “Effect of confinement of bond strength between steel.” ACI Struct. J. 101 (5): 595–603.
Harris, H. G., W. Somboonsong, and F. K. Ko. 1998. “New ductile hybrid FRP reinforcing bar for concrete structures.” J. Compos. Constr. 2 (1): 28–37. https://doi.org/10.1061/(ASCE)1090-0268(1998)2:1(28).
Issa, M. A. 1999. “Investigation of cracking in concrete bridge decks at early ages.” J. Bridge Eng. 4 (2): 116–124. https://doi.org/10.1061/(ASCE)1084-0702(1999)4:2(116).
Krauss, P. D., and E. A. Rogalla. 1996. Transverse cracking in newly constructed bridge decks. Washington, DC: Transportation Research Board.
Lutz, L. A., and P. Gergely. 1967. “Mechanics of bond and slip of deformed bars in concrete.” ACI J. 64 (11): 711–721.
Mander, J. B., M. J. Priestley, and R. Park. 1988. “Theoretical stress-strain model for confined concrete.” J. Struct. Eng. 114 (8): 1804–1826. https://doi.org/10.1061/(ASCE)0733-9445(1988)114:8(1804).
Mirmiran, A., and M. Shahawy. 1997. “Behavior of concrete columns confined by fiber composites.” J. Struct. Eng. 123 (5): 583–590. https://doi.org/10.1061/(ASCE)0733-9445(1997)123:5(583).
Nanni, A., A. De Luca, and H. Jawaheri Zadeh. 2014. Reinforced concrete with FRP bars: Mechanics and design. Boca Raton, FL: CRC Press.
Ramey, G. E., A. R. Wolff, and R. L. Wright. 1997. “Structural design actions to mitigate bridge deck cracking.” Pract. Period. Struct. Des. Constr. 2 (3): 118–124. https://doi.org/10.1061/(ASCE)1084-0680(1997)2:3(118).
RILEM (International Union of Laboratories and Experts in Construction Materials, Systems, and Structures). 1994. “RC6–Bond test for reinforcement steel. 2. Pull-out test.” In RILEM recommendations for the testing and use of constructions materials, 218–220. London: E. & F. N. Spon.
Rodriguez, J., L. M. Ortega, and J. Casal. 1997. “Load carrying capacity of concrete structures with corroded reinforcement.” Constr. Build. Mater. 11 (4): 239–248. https://doi.org/10.1016/S0950-0618(97)00043-3.
Schmitt, T. R., and D. Darwin. 1999. “Effect of material properties on cracking in bridge decks.” J. Bridge Eng. 4 (1): 8–13. https://doi.org/10.1061/(ASCE)1084-0702(1999)4:1(8).
Shin, M., and B. Andrawes. 2010. “Experimental investigation of actively confined concrete using shape memory alloys.” Eng. Struct. 32 (3): 656–664. https://doi.org/10.1016/j.engstruct.2009.11.012.
Tastani, S. P., and S. J. Pantazopoulou. 2009. “Direct tension pullout bond test: Experimental results.” J. Struct. Eng. 136 (6): 731–743. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000159.
Torre-Casanova, A., L. Jason, L. Davenne, and X. Pinelli. 2013. “Confinement effects on the steel-concrete bond strength and pull-out failure.” Eng. Fract. Mech. 97 (Jan): 92–104. https://doi.org/10.1016/j.engfracmech.2012.10.013.
Treece, R. A., and J. O. Jirsa. 1989. “Bond strength of epoxy-coated reinforcing bars.” ACI Mater. J. 86 (2): 167–174.
Vu, K. A. T., and M. G. Stewart. 2000. “Structural reliability of concrete bridges including improved chloride-induced corrosion models.” Struct. Saf. 22 (4): 313–333. https://doi.org/10.1016/S0167-4730(00)00018-7.
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©2019 American Society of Civil Engineers.
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Received: May 23, 2018
Accepted: Feb 22, 2019
Published online: May 24, 2019
Published in print: Aug 1, 2019
Discussion open until: Oct 24, 2019
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