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Title:Fatigue Performance Of Idot Mixtures
Author(s):Carpenter, Samuel H.
Subject(s):Perpetual pavement, fatigue, fatigue endurance limit, rich bottom binder
Abstract:The fatigue characteristics of an HMA mixture are an integral element of the structural design of a pavement containing asphalt concrete. There are a number of models that have been developed to express the fatigue behavior of an HMA as a function of mixture composition. These models are presented and the shortcomings are discussed relative to the IDOT tensile strain model of the form K1(1/ε)K2. Two sets of IDOT mixtures were investigated for this study: • The first was a general, pre-Superpave selection of IDOT mixtures. • The second was a set from the Extended Life Hot Mix Asphalt Pavement ELHMAP project, representing Superpave mixtures and rich bottom binder (RBB) mixtures. The fatigue model coefficients of these tests are examined and suggestions relative to acceptable coefficients for IDOT use are made, specifically: • K2 = 3.5 to include all mixtures tested. • K2 = 4.0 to include nearly ninety percent of mixtures tested. • K2 = 4.5 for the average value of mixtures tested. The test results clearly indicate the interrelationship between K1 and K2 that must be observed to avoid significant errors in fatigue life prediction given that all models in current use have a constant K2 regardless of the K1 value calculated from mixture variables. The testing also examined the Fatigue Endurance Limit (FEL) of these two data sets which shows that binder type may influence the limit, but in no cases was a strain below 70 micro-strain required to get an extraordinarily long fatigue life. The effect of the RBB mixtures on fatigue resistance was positive but marginal.
Issue Date:2006-07
Genre:Technical Report
Publication Status:published or submitted for publication
Peer Reviewed:not peer reviewed
Sponsor:Illinois Department of Transportation ICT/IHR-R39
Rights Information:No restrictions. This document is available to the public through the National Technical Information Service, Springfield, Virginia 22161
Date Available in IDEALS:2013-11-14

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