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.
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© 2014 American Society of Civil Engineers.
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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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