Exploring the Effect of Asphalt-Concrete Fabrication and Compaction Location on Six Compaction Metrics
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 12
Abstract
Ensuring proper compaction of asphalt concrete in the field is necessary for high performance of pavements, and understanding how different asphalt concrete technologies compact can lead to better compaction in the field. This research examines a chemically modified warm-mix asphalt material that was (1) plant mixed, lab compacted; (2) reheated, plant mixed, lab compacted; and (3) lab mixed, lab compacted, and explores how changing the compaction temperatures and compaction pressures influences the compaction characteristics in the lab. In addition, the chemically modified warm-mix asphalt was compared to foamed material and traditional hot-mix asphalt in the lab-mixed lab-compacted state. Overall, workability energy index (WEI), compactability energy index (CEI), compaction densification index (CDI), and number of gyrations required to reach 92% maximum specific gravity () (N92) followed expected trends of increasing compaction effort required with decreasing temperature or pressure, while locking point and gyratory compactibility index (GCI) did not. For the chemically modified warm-mix asphalt, WEI provided the most-consistent results across sample preparation methods, compaction temperatures, and compaction pressures. However, trends were not as clear when comparing chemically modified warm-mix asphalt, foamed warm-mix asphalt, and hot-mix asphalt.
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Acknowledgments
The University of Arkansas thanks Road Science, especially Craig Good, Lou Harper, and A.J. Jensen, for their generous assistance with this project; APAC-Kansas and Max VanArsdale; and Cory Bramlett, Reihle Saldana, Zachary Lemmon, Airam Morales, and Elvis Castillo for their assistance in the laboratory.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 12 • December 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Nov 16, 2015
Accepted: May 2, 2016
Published online: Jul 14, 2016
Published in print: Dec 1, 2016
Discussion open until: Dec 14, 2016
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