Indirect Tension Relaxation Test to Evaluate the Effect of the Addition of RAP to HMA Mixes
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 3
Abstract
A total of 160 different hot mix asphalt (HMA) combinations of binders, aggregates, and reclaimed asphalt pavement (RAP) were compacted and tested using indirect tension stress relaxation at two temperatures (5 and ). Two relaxation characteristics from a power law fit through the data were used to define the effect of RAP on the HMA binder-related properties: the initial modulus at (regression constant) and the curvature coefficient (regression exponent). The results showed there is a nonlinear relationship between both the initial modulus and the curvature coefficient and the percent RAP from 0 to 100% RAP. A linear relationship can only be obtained between the properties and the percent RAP between 0 and 50%. There is little change in either the initial modulus or curvature coefficient for HMA mixes with 50 or more RAP. When three tests per sample are averaged, the coefficient of variation is 18 and 7% for the initial modulus and curvature coefficient, respectively.
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Acknowledgments
The writers would like to thank TA Instruments for the loan of a rheometer and the National Center for Asphalt Technology (NCAT) for making all the arrangement with TA Instruments. They would also like to thank Guy Savage at EAP for providing HMA for testing.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 3 • March 2007
Pages: 219 - 226
Copyright
© 2007 ASCE.
History
Received: Nov 22, 2004
Accepted: Dec 28, 2005
Published online: Mar 1, 2007
Published in print: Mar 2007
Notes
Note. Associate Editor: Eyad Masad
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