One of the main components of the Superpave mixture design andanalysis system, originally developed under the Strategic HighwayResearch Program (SHRP), is a mechanics-based thermal crackingperformance prediction model (TCMODEL). Thermal stresses are predictedby TCMODEL based upon a viscoelastic characterization of the asphaltmixture at low temperatures. The sophisticated viscoelastic stressanalysis performed carefully tracks the stress history of themixture, and consequently, mixture properties must be known atvery long loading times. The time-temperature superposition principlehas been employed to allow the required properties to be obtainedfrom creep tests of relatively short duration. However, the techniquesoriginally used in Superpave to construct the creep compliancemaster curve have been found to be problematic (Buttlar and Roque,1996a). New analysis techniques are presented which were foundto produce accurate performance predictions with as little as100 seconds of creep testing and without the need for supplementarybinder data.