Effects of Aggregate Concepts on the Workability of Slip-Formed Concrete
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 10
Abstract
Only a small amount of published literature has presented any agreement on how aggregate properties affect the workability of concrete, and some of these historic aggregate design methods may give conflicting recommendations. This research aims to provide insight by comparing several historic aggregate concepts to the workability performance of low flow concrete for slip-formed applications. The workability performance of each mixture was measured using the slump test and the box test. By leaving the paste volume constant and systematically changing aggregate concepts such as gradations and proportioning techniques, it allowed for a quantitative comparison between these different aggregate concepts and techniques. The results show the individual percent retained (IPR) chart was the most useful to predict influences of aggregate gradation. Other aggregate gradation and proportioning concepts such as the coarseness-factor chart, the Power 45 chart, specific surface area, and some popular packing methods were not able to accurately predict workability performance for slip-formed applications. The shape and texture of aggregate was also shown to be important for workability of these mixtures.
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Acknowledgments
The authors would like to express their appreciation to the National Concrete Pavement Technology Center and Oklahoma Department of Transportation for providing research funds and to Peter Taylor and Gary Fick for offering valuable comments about the project.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 10 • October 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Aug 21, 2015
Accepted: Feb 2, 2016
Published online: Apr 25, 2016
Discussion open until: Sep 25, 2016
Published in print: Oct 1, 2016
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