Influence of Fly Ash as Cement Replacement on the Properties of Recycled Aggregate Concrete
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 9
Abstract
The use of high percentages of recycled aggregates in concrete would usually worsen the concrete properties. This paper tries to address the deficiency of the use of recycled aggregates by systematically presenting results on the influence of incorporating Class F fly ash on concrete properties. In this study, two series of concrete mixtures were prepared with water-to-binder (W/B) ratios of 0.45 and 0.55. The recycled aggregate was used as 0, 20, 50, and 100% by weight replacements of natural aggregate. In addition, fly ash was used as 0, 25, and 35% by weight replacements of cement. The results showed that the compressive strengths, tensile strengths, and static modulus of elasticity values of the concrete at all ages decreased as the recycled aggregate and the fly ash contents increased. Further, an increase in the recycled aggregate content decreased the resistance to chloride ion penetration and increased the drying shrinkage and creep of concrete. Nevertheless, the use of fly ash as a substitute for cement improved the resistance to chloride ion penetration and decreased the drying shrinkage and creep of the recycled aggregate concrete. The results showed that one of the practical ways to utilize a high percentage of recycled aggregate in structural concrete is by incorporating 25–35% of fly ash as some of the drawbacks induced by the use of recycled aggregates in concrete could be minimized.
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Acknowledgments
The writers would like to thank the Environment and Conservation Fund, the Woo Wheelock Green Fund and the Hong Kong Polytechnic University for funding support.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 9 • September 2007
Pages: 709 - 717
Copyright
© 2007 ASCE.
History
Received: May 23, 2005
Accepted: Mar 19, 2007
Published online: Sep 1, 2007
Published in print: Sep 2007
Notes
Note. Associate Editor: Shin-Che Huang
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