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38 Dynamic Modulus: The absolute value of the complex modulus of a viscoelastic material calculated by dividing the peak-to-peak stress by the peak-to-peak strain for a material subjected to a sinusoidal loading. Dynamic Modulus Master Curve: A composite curve constructed at a reference temperature by shifting dynamic modulus data from var- ious temperatures along the log frequency axis. First Article Devices: Prototype equipment produced primarily for evaluation. Flow Number: The number of load cycles corresponding to the mini- mum rate of change of permanent axial strain during a repeated load test. Flow Time: The time corresponding to the minimum rate of change of axial strain during a creep test. Extensometer: Self contained device that measures strain or deforma- tion over a fixed gauge length. Level 1 Analysis: The Mechanistic-Empirical Pavement Design Guide provides the option to choose between three levels for input data. Level 1 is the most extensive input data requiring measured mate- rial properties or traffic data. Linearly Variable Differential Transformer: Electronic device consis- tent of a coil and a core that measures displacement. The signal from the device varies linearly with the position of the core in the coil. Mechanistic-Empirical Pavement Design Guide: The mechanistic- empirical pavement design procedure developed in National Cooperative Highway Research Program Project 1-37A. Reduced Frequency: The computed frequency at the reference temperature equivalent to the actual loading frequency at the test temperature. Reference Temperature: The temperature at which the master curve is constructed. Servo-hydraulic: A closed-loop hydraulic testing machine that responds to minimize the difference between the command signal and the feedback signal from a transducer attached to the test specimen. Shift Factor: Shift in frequency associated with a shift from a test tem- perature to the reference temperature. Simple Performance Tests: Mechanical tests for asphalt concrete mix- tures that are related to pavement performance and can be used in the mixture design process to evaluate the performance of a mixture. Simple Performance Test Specimen Fabrication System: An auto- mated device for preparing test specimens for the Simple Perfor- mance Test System. Simple Performance Test System: Commercial testing equipment developed in National Cooperative Highway Research Program Project 9-29 to perform the Simple Performance Tests. Solverâ¢: A function included in Microsoft Excel⢠that performs non- linear optimization. This function can be used to assemble dy- namic modulus master curves. Superpave Volumetric Mixture Design: Volumetric design procedure for dense-graded hot-mix asphalt that was developed during the Strategic Highway Research Program. Glossary
