State of Knowledge for Cantabro Testing of Dense Graded Asphalt
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 10
Abstract
This paper uses information collected over several years to determine where the Cantabro test usefully characterizes dense graded asphalt (DGA). The Cantabro mass loss (CML) procedure is simple, expedient, and has been used for open graded materials for years. A database of approximately 1,200 measurements was analyzed alongside information from the literature to assess the usefulness of the CML procedure for DGA because this is not nearly as common as for open graded materials. Findings showed that several of the factors leading to durable mixes have been cited in the literature for some time but that a mix test to routinely assess all factors simultaneously has not found its way into routine practice. A mix test of this nature is needed now more than ever given that one of the main challenges is to produce mixes better balanced between rutting and cracking. Analysis showed that the Cantabro test detected the following items known to affect performance: binder grade, presence of polymer, difference between ground tire rubber and SBS modification, aggregate type, reclaimed asphalt pavement (RAP) content, density (air voids), volume of effective binder, and aging.
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Acknowledgments
The Mississippi Department of Transportation and Ergon A&E, Inc., funded portions of the original studies that produced the data used in this paper. The Asphalt Mixture & Binder Expert Task Groups (ETGs) provided information on balanced mix design. Individuals who contributed to this effort include Shane Buchanan, Mike Heitzman, Jesse Doyle, John Bukowski, Gaylon Baumgardner, Louay Mohammad, and L. Allen Cooley, Jr. Permission to publish was granted by the director of the Geotechnical and Structures Laboratory, U.S. Army Research and Development Center.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 10 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Nov 28, 2016
Accepted: Mar 25, 2017
Published online: Jul 6, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 6, 2017
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