Properties of Concrete Containing Construction and Demolition Wastes and Fly Ash
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 12
Abstract
This paper reports the properties of concrete containing recycled coarse aggregate (RCA) sources from local construction and demolition (C&D) wastes and fly ash (FA) sourced from Western Australia (WA). The RCA is used as 25, 50, 75, and 100% (by weight) replacement of natural coarse aggregate (NCA). In addition, the effect of 40% (by weight) class F fly ash as partial replacement of cement on the properties of recycled aggregate concrete is also evaluated. The properties of concrete evaluated are the compressive strength, indirect tensile strength, flexural strength, and water absorption. All properties are measured at 7, 28, 56, and 91 days. The results show that better compressive, tensile, and flexural strength of concrete containing 25% RCA as partial replacement of NCA can be obtained in recycled aggregate concrete. However, in the case of recycled aggregate concretes containing 40% fly ash, the compressive strength at later ages, such as at 56 and 91 days is increased but the indirect tensile and flexural strengths are decreased at all ages. It is observed that the water absorption is decreased as RCA content increased. It is also observed that the water absorption is decreased significantly in recycled aggregate concretes containing 40% fly ash at all ages.
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Acknowledgments
The author acknowledges All Earth Group for donating the recycled aggregates and Fly ash Australia for donating the class F fly ash. Grateful acknowledgment is also due to final year project students Mr. Joshua Bruins and Mr. Tristan Iriks for their assistance in casting and testing of specimens in this study.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 12 • December 2013
Pages: 1864 - 1870
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jun 12, 2012
Accepted: Dec 14, 2012
Published online: Dec 17, 2012
Discussion open until: May 17, 2013
Published in print: Dec 1, 2013
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