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Advances in Civil Engineering
Volume 2010, Article ID 329084, 10 pages
http://dx.doi.org/10.1155/2010/329084
Research Article

Aging Influence on Fatigue Characteristics of RAC Mixtures Containing Warm Asphalt Additives

1Asphalt Rubber Technology Service, Department of Civil Engineering, Clemson University, Clemson, SC 29634-0911, USA
2Department of Civil Engineering, Clemson University, Clemson, SC 29634-0911, USA

Received 31 May 2009; Revised 14 January 2010; Accepted 9 February 2010

Academic Editor: Cumaraswamy Vipulanandan

Copyright © 2010 Feipeng Xiao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Aging is an important factor to affect the long-term performance of asphalt pavement. The fatigue life of a typical warm mix asphalt (WMA) is generally related to various factors of rheological and mechanical properties of the mixture. The study of the fatigue behavior of the specific rubberized WMA is helpful in recycling the scrap tires and saving energy in terms of the conventional laboratory aging process. This study explores the utilization of the conventional fatigue analysis approach in investigating the cumulative dissipated, stiffness, and fatigue life of rubberized asphalt concrete mixtures containing the WMA additive after a long-term aging process. The aged beams were made with one rubber type (−40 mesh ambient crumb rubber), two aggregate sources, two WMA additives (Asphamin and Sasobit), and tested at 5 and . A total of 55 aged fatigue beams were tested in this study. The test results indicated that the addition of crumb rubber extends the fatigue resistance of asphalt binder while WMA additive exhibits a negative effect. The study indicated that the WMA additive generally has an important influence on fatigue life. In addition, test temperature and aggregate source play an important role in determining the cumulative dissipated energy, stiffness, and fatigue life of an aged mixture.