Using Recycled Concrete Aggregates in New Zealand Ready-Mix Concrete Production
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 5
Abstract
Motivations for adopting recycled concrete as an aggregate source include the preservation of natural resources, effective utilization of a growing waste stream, and financial and energy savings. Although current New Zealand practices include some use of crushed concrete in road construction, use of recycled concrete aggregate (RCA) in low specification concrete is currently infrequent and the use of recycled concrete as an aggregate source in structural concrete applications is rare. To make such recycling feasible, the properties of RCA must be related to the properties of new concrete that utilizes the recycled aggregates. In response to this need, a study was undertaken to investigate the feasibility of using RCA as a viable alternative to natural aggregate (NA) in the production of concrete manufactured in a conventional New Zealand ready mix concrete plant. Aggregate properties and hardened and fresh concrete properties of RCA concrete were studied and compared with the associated properties derived from NA concrete. Results indicated that RCA is a viable alternative to NA in the production of concrete. Furthermore, it was confirmed that the properties of RCA dictate the hardened properties of the reconstituted concrete and that RCA from certain strength placements limited the resulting possible strengths of concrete produced from it.
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Acknowledgments
The writers wish to thank Timothy Walker of Conslab Ltd., Ken Duncalfe of Fulton Hogan Ltd., Opinda Saggi, Chris Munn, and Jim Shaw of Allied Concrete Ltd., and Dr. James Mackechnie from the University of Canterbury for their invaluable assistance with this project.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 5 • May 2010
Pages: 443 - 450
Copyright
© 2010 ASCE.
History
Received: May 20, 2009
Accepted: Aug 28, 2009
Published online: Apr 15, 2010
Published in print: May 2010
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