Journal Published Online: 16 February 2007
Volume 35, Issue 4

Characterization of Thermal Degradation of Liquid Amine Anti-Strip Additives in Asphalt Binders Due to RTFO and PAV-Aging

CODEN: JTEVAB

Abstract

In this study, thermal degradation of amine-based liquid anti-strip additives was evaluated due to RTFO-aging and PAV-aging according to AASHTO T 240 and AASHTO R 28 test methods, respectively. The surface free energy (SFE) characteristics of asphalt binders before and after aging were used as a tool for this evaluation. Two asphalt binders, namely PG 64-22 and PG 70-28, and two anti-strip additives, namely AD-Here HP Plus and Redicote E-6, were evaluated. It was observed for 0.75 % AD-Here HP Plus in PG 64-22, mixing at 163°C is more effective than mixing at 145°C with respect to increase in SFE. Also, both RTFO and PAV-aging decrease the total SFE of asphalt binders; both the aging processes are more effective in PG 64-22. In addition, the beneficial effect of anti-strip additives in acid-base characteristics of asphalt binders is severely reduced by RTFO and PAV-aging. Finally, the chemical model of asphalt binder, proposed by Wasiuddin , was expanded to include the SFE characteristics of asphalt binders due to aging.

Author Information

Wasiuddin, Nazimuddin
School of Civil Engineering and Environmental Science, University of Oklahoma, Norman, OK
Fogle, Chris
School of Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK
Zaman, Musharraf
College of Engineering, University of Oklahoma, OK
O’Rear, Edgar
University of Oklahoma, Norman, OK
Pages: 8
Price: $25.00
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Stock #: JTE100660
ISSN: 0090-3973
DOI: 10.1520/JTE100660