Abstract
AbstractPerpetual pavements, if properly designed and rehabilitated, last longer than 50 years without major structural rehabilitation. The fatigue endurance limit (EL) is a key parameter for designing perpetual pavements to mitigate bottom-up fatigue cracking. The endurance limit has not been completely implemented in the Mechanistic Empirical Pavement Design Guide software, currently known as AASHTOWare Pavement ME Design software. This study was conducted as part of the National Cooperative Highway Research Program (NCHRP) project 9-44A to develop a framework and mathematical methodology to determine the EL for hot mix asphalt (HMA) using the uniaxial tension-compression fatigue test. In this unique procedure, the EL is defined as the allowable tensile strains at which a balance takes place between the fatigue damage during loading and the healing during rest periods between loading pulses. The viscoelastic continuum damage model was applied into the data analysis. This study also included the developm...
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