Shrinkage Behavior of Sustainable Concrete with Crushed Returned Concrete Aggregate
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 7
Abstract
In the current trend of sustainability, the concrete community has been aggressively looking into adopting green construction material practices and at the same time improving concrete quality and performance for extensive service life and adaptive reuse. Concrete is the construction material most used in the world, with an estimated yearly production of 2.35 billion tons worldwide. In the United States, it is estimated that on average approximately 5% of the ready-mix concrete produced is unused and returned to the plant with only a small portion reused. Such a material when further processed, identified as crushed returned concrete aggregate (CCA), has a significant residual value because among other things it is free of contaminants and has better quality than recycled concrete aggregate (RCA). The objective of this study was to assess the shrinkage behavior of CCA concrete mixtures produced with aggregate from returned concrete. The aggregate was prepared from concrete of different strength. The virgin aggregate (stone) was replaced either partially or at 100% level in the concrete mixtures. The response of the hyperbolic shrinkage prediction model was examined, and based on the experimental results an alternative model is proposed. The proposed model and methodology can be used to estimate the drying shrinkage of CCA mixtures, and eventually can be adopted for assessing the shrinkage behavior of these concrete mixtures in other regions.
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Acknowledgments
The authors would like to acknowledge the support of NRMCA and the valuable contributions of Dr. Karthik Obla.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 7 • July 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 18, 2013
Accepted: Jul 23, 2014
Published online: Aug 26, 2014
Discussion open until: Jan 26, 2015
Published in print: Jul 1, 2015
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