Effect of Aggregate Gradation on Asphalt Mixture Compaction Parameters
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 9
Abstract
In this study, the effect of aggregate gradation on asphalt mixture compactability was investigated. Based on different combinations of coarse and fine aggregates, four gradation zones were defined: coarse pack, coarse dense pack, fine dense pack, and fine pack. Two main compaction parameters (the compaction slope and initial density) and three gradation parameters (chosen to describe the representative size and uniformity of the gradation) were compared. Statistical analyses indicated a significant correlation between the two compaction parameters as response variables and three gradation parameters as explanatory variables. These relationships were used to determine the optimum aggregate gradation with respect to asphalt mixture compactability and rutting performance. The models developed using the gradation parameters were used with two independent data sets (one from a laboratory experiment and one from a field project) to show that the parameters can predict the compactability behavior of asphalt mixtures.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published paper.
Acknowledgments
This research work was supported by the Indiana Department of Transportation (INDOT) and Joint Transportation Research Program (JTRP). The contents of this paper reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the sponsors. These contents do not constitute a standard, specification, or regulation.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 9 • September 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Aug 19, 2019
Accepted: Feb 12, 2020
Published online: Jun 23, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 23, 2020
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