Bond of Reinforcement in Concrete Incorporating Recycled Concrete Aggregates
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VIEW THE REPLYPublication: Journal of Structural Engineering
Volume 141, Issue 3
Abstract
Using recycled concrete aggregates (RCAs) as coarse aggregate in concrete has the potential to supplement current natural aggregate reserves, divert construction and demolition debris from landfills, and promote the adoption of sustainable civil infrastructure. As many of the design equations used to calculate structural concrete properties are based on empirical data for natural aggregate concrete, using these equations for RCA concrete may not be applicable. This study examined the bond of reinforcement in concrete produced using RCA as coarse aggregate. One natural aggregate (NA) and three RCA sources were evaluated and used as coarse aggregate in 14 separate concrete mixtures with four compressive strength levels. Various concrete mechanical properties, including compressive strength, splitting tensile strength, modulus of rupture, and fracture energy, were tested, and correlations between these properties and reinforcement bond were studied. The reinforcement bond was measured using 48 beam-end specimens incorporating several bonded lengths. The results showed that bond strength of RCA concrete was reduced by up to 21% in comparison to NA concrete, and that there was a strong correlation between bond strength and coarse aggregate crushing strength. A regression model was developed to relate bond strength to coarse aggregate strength, concrete compressive strength, and the bonded length. Using this model, experimentally predicted development lengths were calculated to be up to 9% greater for RCA concrete members in comparison to NA concrete members. Overall, this study was directed at providing guidance on the evaluation of multiple RCA sources and their respective impact on the bond of reinforcement in structural concrete.
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Acknowledgments
The authors would like to thank Steed and Evans Construction, the Greater Toronto Airports Authority, Dufferin Aggregates, Lafarge, and St. Mary’s Cement for their donations of materials for use on this project; the University of Waterloo and the Center for Pavement and Transportation Technology (CPATT) for the use of their laboratory facilities; and Mr. Rico Fung from the Cement Association of Canada in conjunction with the National Sciences and Engineering Research Council of Canada for generously funding this research.
References
Ajdukiewicz, A., and Kliszczewicz, A. (2002). “Influence of recycled aggregates on mechanical properties of HS/HPC.” Cem. Concr. Comp., 24(2), 269–279.
American Concrete Institute (ACI). (2003). “Bond and development of straight reinforcing bars in tension.”, Farmington Hills, MI.
American Concrete Institute (ACI). (2011). “Building code requirements for structural concrete.”, Farmington Hills, MI.
ASTM. (2005). “Standard test method for comparing bond strength of steel reinforcing bars to concrete using beam-end specimens.”, West Conshohocken, PA.
British Standards Institute (BSI). (1990). “Testing aggregates—methods for determination of aggregate crushing value (ACV).”, London.
Butler, L. (2012). “Evaluation of recycled concrete aggregate performance in structural concrete.” Ph.D. Dissertation, Univ. of Waterloo, Waterloo, Ontario, Canada.
Butler, L., West, J. S., and Tighe, S. L. (2011). “The effect of recycled concrete aggregate properties on the bond strength between RCA concrete and steel reinforcement.” Cem. Concr. Res., 41(10), 1037–1049.
Butler, L., West, J. S., and Tighe, S. L. (2012). “Effect of recycled concrete aggregate properties on the mixture proportions of structural concrete.” Transportation Research Record: Journal of the Transportation Research Board, Washington, DC, 105–114.
Canadian Standards Association (CSA). (2004). “Design of concrete structures.”, Ottawa, Canada.
Canadian Standards Association (CSA). (2009). “Concrete materials and methods of concrete construction.”, Ottawa, Canada.
Choi, H. B., and Kang, K. I. (2008). “Bond behaviour of deformed bars embedded in RAC.” Mag. Concr. Res., 60(6), 399–410.
Darwin, D., Barham, S., Kozul, R., and Luan, S. (2001). “Fracture energy of high-strength concrete.” ACI Mater. J., 98(5), 410–417.
Fathifazl, G., Razaqpur, A. G., Isgor, O. B., Abbas, A., Fournier, B., and Foo, S. (2011). “Shear capacity evaluation of steel reinforced recycled concrete (RRC) beams.” Eng. Struct., 33(3), 1025–1033.
Fathifazl, G., Razaqpur, A. G., Isgor, O. B., Abbas, A., Fournier, B., and Foo, S. (2012). “Bond performance of deformed steel reinforcements embedded in concrete produced with coarse recycled concrete aggregate (RCA).” Can. J. Civ. Eng., 39(2), 128–139.
Gonzalez-Fonteboa, B., and Martinez-Abella, F. (2007). “Shear strength of recycled concrete beams.” Constr. Build. Mater., 21(4), 887–893.
Hillerborg, A. (1986). “The theoretical basis of a method to determine the fracture energy Gf of concrete.” Mater. Struct., 18(106), 291–296.
Juan, M. S., and Gutierrez, P. A. (2009). “Study on the influence of attached mortar content on the properties of recycled concrete aggregate.” Constr. Build. Mater., 23(2), 872–877.
Levy, S. M., and Helene, P. (2004). “Durability of recycled aggregates concrete: A safe way to sustainable development.” Cem. Concr. Res., 34(11), 1975–1980.
Martin, J., Stanton, J., Mitra, N., and Lowes, L. N. (2007). “Experimental testing to determine concrete fracture energy using simple laboratory test setup.” ACI Mater. J., 104(5), 575–584.
Otsuki, N., Miyazato, S. I., and Yodsudjai, W. (2003). “Influence of recycled aggregate on interfacial transition zone, strength, chloride penetration and carbonation of concrete.” ASCE J. Mater. Civ. Eng., 15(3), 443–451.
RILEM. (1985). “Determination of the fracture energy of mortar and concrete by means of three-point bend tests on notched beams. TC 50-FMC Fracture Mechanics of Concrete. RILEM Recommendation.” Mater. Struct., 18(106), 287–290.
Topcu, I. B., and Sengel, S. (2004). “Properties of concretes produced with waste concrete aggregate.” Cem. Concr. Res., 34, 1307–1312.
Xiao, J., and Falkner, H. (2007). “Bond behaviour between recycled aggregate concrete and steel rebars.” Constr. Build. Mater., 21(2), 395–401.
Zuo, J., and Darwin, D. (2000). “Splice strength of conventional and high relative rib area bars in normal and high-strength concrete.” ACI Struct. J., 97(4), 630–641.
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Published In
Journal of Structural Engineering
Volume 141 • Issue 3 • March 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Aug 29, 2012
Accepted: Aug 21, 2013
Published online: Feb 12, 2014
Discussion open until: Jul 12, 2014
Published in print: Mar 1, 2015
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