New Mixture Proportioning Method for Concrete Made with Coarse Recycled Concrete Aggregate
Publication: Journal of Materials in Civil Engineering
Volume 21, Issue 10
Abstract
New method of mixture proportioning is proposed for concrete made with coarse recycled concrete aggregates (RCA). The proposed method, dubbed the “equivalent mortar volume” method, is predicated on the fact that RCA is a two-phase material comprising mortar and natural aggregate; therefore, when proportioning a concrete mixture involving RCA, one must account for the quantity and quality of each phase and adjust both the coarse aggregate and fresh paste content of the mix accordingly to achieve the same total mortar volume as a companion mix with the same specified properties but made entirely with coarse natural aggregates of similar properties to the coarse natural aggregate contained in RCA. Using the proposed method and the conventional aggregate replacement method, a large number of mixes was made with RCA obtained from two demolition waste recycling plants. For each mix, its slump, fresh and hardened densities, compressive strength, and elastic moduli were measured. The results showed that using the proposed method, unlike the conventional method, yields concrete mixes with consistent, predictable, and comparable properties to those of similar mixes made with natural aggregates.
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Acknowledgments
The writers express their gratitude to Public Works and Government Services Canada and to the Natural Sciences and Engineering Research Council Canada for their financial support. They are also grateful to Canada Centre for Mineral and Energy Technology (CANMET), Department of Natural Resources Canada, for providing extensive technical assistance and laboratory facilities in support of this research. Special thanks are extended to the RichVan Holdings Ltd of Richmond, BC and Groupe Beauval, Montréal, PQ for providing the RCA used in this study.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 21 • Issue 10 • October 2009
Pages: 601 - 611
Copyright
© 2009 ASCE.
History
Received: Jun 11, 2008
Accepted: Mar 26, 2009
Published online: Sep 15, 2009
Published in print: Oct 2009
Notes
Note. Associate Editor: Anand J. Puppala
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