Existence of Dividing Strength in Concrete Containing Recycled Coarse Aggregate
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 4
Abstract
Concrete is a composite material consisting of mortar and coarse aggregates. The use of recycled aggregates in concrete is increasing gradually. Recycled coarse aggregates are highly porous and often contain microcracks and weak interfacial transition zone (ITZ). Therefore, the recycled aggregates are weaker than natural coarse aggregate and their modulus of elasticity (E) is expected to be lower than that of natural coarse aggregate. This paper examines and presents the existence of dividing strength in concrete containing recycled coarse aggregate. In this study 192 concrete cylinders () and 192 mortar cubes () were cast and tested at 28 days for compressive strengths of natural aggregate concretes (NAC) and recycled aggregate concretes (RAC). In the case of NAC, the linear relationship between the compressive strength of concrete and that of mortar is observed. However, in the case of RAC, a distinct two-stage relationship between concrete strength and mortar strength is observed indicating the existence of the dividing strength of recycled aggregate concrete. This paper emphasizes that more research needs to be conducted in the existence of dividing strength as the properties of recycled coarse aggregates very quite substantially depending on the contents.
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Acknowledgments
The author acknowledges All Earth Group for donating the recycled coarse aggregates (RCA). Grateful acknowledgement is also due to final year project student Mr. Christopher Edwards for his assistance in casting and testing of specimens in this study.
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Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 4 • April 2014
Pages: 784 - 788
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 19, 2013
Accepted: May 29, 2013
Published online: Jun 1, 2013
Discussion open until: Nov 1, 2013
Published in print: Apr 1, 2014
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