Evaluation of Viscosity Values for Mixing and Compaction Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 18, Issue 4
Abstract
For many years, ASTM D 2493 has been used as a reference for determining mixing and compaction temperatures for asphalt binders. However, this method only applies to neat or unmodified binders. With the inception of modified binders, which incorporate various additives that stiffen binders, this method predicts unreasonably high mixing and compaction temperatures. The current study examined 50 commercially available binders. In this study, the viscosity values that are used for temperature selection were evaluated. Modified binders that are currently in industry are stiff, which makes it not possible to achieve reasonable temperatures using the current viscosity values. Therefore it was necessary to determine more appropriate viscosity ranges. Based on testing done with these binders, more reasonable viscosity ranges, centered on values of 0.275 and , were chosen. The new viscosity range, coupled with a higher shear rate of , resulted in more reasonable mixing and compaction temperatures that were from lower than the traditional method.
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References
ASTM. (1962). “Symposium on fundamental viscosity of bituminous materials.” Special Technical Publication No. 328, New York.
ASTM. (2001). “Standard viscosity temperature chart for asphalts.” ASTM D 2493, Annual Book of ASTM Standards V. 05.01 (Petroleum Products and Lubricants), West Conshohocken, Pa.
The Asphalt Institute. (2001). Superpave mix designs, Superpave Series No. 2 (SP-2), 3rd Ed., Lexington, Ky.
The Asphalt Institute Online. (2003). “Laboratory mixing and compaction temperatures.” Asphalt Institute Technical Bulletin, ⟨http://www.asphaltinstitute.org/upload/Lab_Mixing_Compaction_Temps.pdf⟩ (Jan. 5, 2004).
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Information & Authors
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Published In
Copyright
© 2006 ASCE.
History
Received: Jul 20, 2004
Accepted: Sep 22, 2005
Published online: Aug 1, 2006
Published in print: Aug 2006
Notes
Note. Associate Editor: Louay N. Mohammad
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