Effect of Contamination on Reinforcing Bar-Concrete Bond
Publication: Journal of Performance of Constructed Facilities
Volume 24, Issue 3
Abstract
Current specifications require the removal of reinforcing bar contaminants that reduce bond prior to placing concrete. This study focused on the interactions of contaminant type, bar size, epoxy coating, concrete strength, and test method (beam and direct pullout). The majority of the beam tests showed the bond strength was not significantly affected, with certain exceptions. However, the direct pullout tests revealed a significant reduction of bond strength in most situations. Although the bond strength was still greater than that required by code, it is recommended that specifications for removal of contaminants should not be relaxed until further study is performed.
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Acknowledgments
For their help with funding, the writers thank the University Transportation Center at Missouri University of Science and Technology, McCarthy Construction, Associated General Contractors, Site Advancement Foundation, Industry Advancement Fund, Southern Illinois Construction Advancement Program, St. Louis Construction Training and Advancement Foundation, and the Erectors and Riggers Association of St. Louis.
References
American Concrete Institute (ACI). (1966). “Bond stress-the state of the art.” American Concrete Institute (ACI) Journal Proceedings, 63(11), 1161–1190.
American Concrete Institute (ACI). (2005). “Standard specifications for structural concrete.” 301-05, Farmington Hills, Mich.
American Concrete Institute (ACI). (2007). “ACI manual of concrete inspection.” SP-2(07), Farmington Hills, Mich.
American Concrete Institute (ACI). (2008). “Building code requirements for structural concrete (ACI 318-08) and commentary.” 318-08, Farmington Hills, Mich.
ASTM. (1997a). “Standard specification for deformed and plain billet-steel bars for concrete reinforcement.” A615/A 615M-96a, West Conshohocken, Pa., 301–305.
ASTM. (1997b). “Standard specification for epoxy-coated steel reinforcing bar.” 775-96, West Conshohocken, Pa., 301–305.
ASTM. (2002). “Standard test method for compressive strength of cylindrical concrete specimens.” C39-01, West Conshohocken, Pa., 21–25.
Bazant, Z. P., and Sener, S. (1988). “Size effect of pullout tests.” ACI Mater. J., 85(5), 347–351.
Castro, P. (1996). “Influence of coatings on bar-concrete bond.” J. Mater. Civ. Eng., 8(4), 212–214.
Darwin, D., Hadje-Ghaffari, H., Choi, O., and McCabe, S. (1994). “Bond of epoxy-coated reinforcement: Cover, casting position, slump, and consolidation.” ACI Struct. J., 91(1), 59–68.
Fu, X., and Chung, D. (1998). “Effects of water-cement ratio, curing age, silica fume, polymer admixtures, steel surface treatments, and corrosion on bond between concrete and steel reinforcing bars.” ACI Mater. J., 95(6), 725–734.
Goto, Y. (1974). “Cracks formed in concrete around deformed tension bars.” ACI J., 68(4), 244–251.
Johnston, B., and Cox, K. (1940). “The bond strength of rusted deformed bars.” ACI J., 37, 57–72.
Kemp, E., Brezny, F. and Unterspan, J. (1968). “Effect of rust and scale on the bond characteristics of deformed reinforcing bars.” ACI J., 65(9), 743–756.
MacGregor, J. (2009). Reinforced concrete-mechanics and design, 3rd Ed., Prentice-Hall, Upper Saddle River, N.J.
Mo, Y., and Chan, J. (1996). “Bond and slip of plain rebars in concrete.” J. Mater. Civ. Eng., 8(4), 208–211.
Orangun, C. O., Jirsa, J. O., and Breen, J. E. (1977). “A reevaluation of test data on development length and splices.” American Concrete Institute (ACI) Journal Proceedings, 74(3), 114–122.
Park, R., and Paulay, T. (1975). “Chapter 9: Bond and anchorage.” Reinforced concrete structures, Wiley, New York, 392–425.
RILEM. (1994a). “RC5: Bond test for reinforcing steel. 1. Beam test.” RILEM technical recommendations for the testing and use of construction materials, 7-II-28 D, E & FN Spon, London, 96–101.
RILEM. (1994b). “RC6: Bond test for reinforcing steel. 1. Pull-out test.” RILEM technical recommendations for the testing and use of construction materials, 7-II-128, E & FN Spon, London, 102–105.
Setareh, M., and Darvas, R. (2007). “Chapter 3: Special topics in flexure.” Concrete structures, Pearson Education, Inc., Upper Saddle River, N.J., 194–195.
Suprenant, B., and Malisch, W. (1998). “How clean must rebar be?” Conc. Constr., 43(6), 517–523.
Information & Authors
Information
Published In
Journal of Performance of Constructed Facilities
Volume 24 • Issue 3 • June 2010
Pages: 206 - 214
Copyright
© 2010 ASCE.
History
Received: Mar 13, 2009
Accepted: Oct 2, 2009
Published online: Nov 6, 2009
Published in print: Jun 2010
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