Aggregate Effects on Pervious Portland Cement Concrete Static Modulus of Elasticity
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 7
Abstract
The effects of aggregate gradation, amount, and size on pervious portland cement concrete (PCC) static modulus of elasticity were compared using four different mixtures. A standard mix and three variable mixes using a uniform gradation, increased aggregate amount, and increased aggregate size were used. The effective air void content was determined for each mixture. The compressive strengths and static elastic moduli were determined and compared at equal void contents. For a uniform gradation, the compressive strengths and static elastic moduli appeared to be higher within an optimal range of voids; however, there was no statistically significant difference between the results from the different gradations. An increased aggregate amount resulted in a statistically significant decrease in both compressive strength and static elastic moduli due to the subsequent decrease in paste amount. While the compressive strengths were higher for mixtures containing smaller aggregate sizes, there was no significant difference between the static elastic moduli when different aggregate sizes were used. Further research is needed to understand the effects of aggregate size on the static modulus of elasticity of pervious PCC.
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Acknowledgments
The writers gratefully acknowledge the financial support of the Tennessee Concrete Association. The research team appreciates material donations from Rogers Group, Inc., MBT Degussa, Irving Materials Inc., Builder’s Supply of Cookeville, Tenn., and the TTU Department of Civil and Environmental Engineering. The writers also appreciate the technical assistance of Jeff Holmes, Tim Dunn, Wes Mittlesteadt, and Ben Byard of TTU. The writers would like to thank the TTU Center for Energy Systems Research for administering the project and providing financial assistance.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 7 • July 2007
Pages: 561 - 568
Copyright
© 2007 ASCE.
History
Received: Jan 11, 2006
Accepted: Dec 28, 2006
Published online: Jul 1, 2007
Published in print: Jul 2007
Notes
Note. Associate Editor: Baoshan Huang
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