The purpose of this research was to develop a simple alternative to flexural fatigue testing for ensuring the fatigue performance of Interlayer Mixture Designs (IMOs) in Wisconsin. The research approach involved producing 15 different mixtures and characterizing these mixtures using the CT index as determined from the ideal CT test, and characterizing the binders used in the mixtures with a variety hosts related to fatigue performance. Using the data produced with these tests, statistical analyses were performed to develop an accurate and simple model that could serve as a basis for a revised, simpler IMO fatigue specification. The final proposed IMO fatigue specification requires a minimum CT index of 140 at 20°C, a maximum binder low temperature grade of -34°C, and a minimum elastic recovery that depends on the non-recoverable creep compliance as determined in AASHTO M 332. The proposed IMO fatigue specification requires no new binder tests and replaces flexural fatigue testing with the much simpler and less expensive IDEAL-CT. There should be no major barriers to implementation.
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United States Department of Transportation
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