%0 Journal Article
%T Aging Influence on Fatigue Characteristics of RAC Mixtures Containing Warm Asphalt Additives
%A Feipeng Xiao
%A Wenbin Zhao
%A Serji N. Amirkhanian
%J Advances in Civil Engineering
%D 2010
%I Hindawi Publishing Corporation
%R 10.1155/2010/329084
%X 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. 1. Introduction The long-term aging process of crumb rubber-modified (CRM) binder and warm mix asphalt (WMA) mixture is a complex process caused by the interaction of the crumb rubber, WMA additive, and the binder. However, Zeng and Huang [1] indicated that laboratory aging methods for simulation of field aging of asphalt binders and evaluation of aging characteristics of virgin or modified asphalt mixtures are effective. In addition, the use of rheological properties of asphalt binders can be used to characterize the asphalt-aggregate mixtures [2]. In terms of its chemical composition, the asphalt binder is a complex mixture of organic molecules, comprised mainly of hydrocarbons with trace amounts of functional groups such as oxygen, nitrogen, and sulfur. Fatigue cracking is often associated with loads that are too heavy for the pavement structure or more repetitions of a given traffic loading than provided for in design. The fatigue life of an asphalt pavement is related to the various aspects of hot mix asphalt (HMA). Previous studies have been conducted to understand how fatigue life can occur and be extended under repetitive traffic loading [3¨C6]. The fatigue life of an asphalt pavement is directly related to various engineering properties of a typical
%U http://www.hindawi.com/journals/ace/2010/329084/