AASHTO PP 96:2018 Proposed Standard Practice for Developing Dynamic Modulus Master Curves for Asphalt Mixtures Using the Indirect Tension Testing Method

AASHTO PP 96:2018 Proposed Standard Practice for Developing Dynamic Modulus Master Curves for Asphalt Mixtures Using the Indirect Tension Testing Method. 3.3. Reduced Frequencv—the computed frequency at the reference temperature equivalent to the actual loading frequency at the test temperature. 3.4. Reference Temperature—the temperature at which the master curve is constructed. 3.5. Shift Factor—shift in frequency associated with a shift from a test temperature to the reference temperature. 4. SUMMARY OF PRACTICE 4.1. This practice describes the testing and analysis needed to develop a dynamic modulus master curve for asphalt mixtures from indirect tension specimens, specifically from field cores. It involves collecting dynamic modulus test data at specified temperatures and loading frequencies, determining time-temperature shift factors from individual temperature data, and finally fitting the test data to obtain a continuous function describing the dynamic modulus as a function of reduced frequency. 5. SIGNIFICANCE AND USE 5.1. Dynamic modulus master curves can be used for mixture evaluation and for characterizing the modulus of asphalt concrete for mechanistic-empirical pavement design. 6. APPARATUS 6.1. Specimen Fabrication Equipment—equipment for fabricating dynamic modulus test specimens as described in AASHTO PP 95, Preparation of indirect Tension Pert brmance Test Specimens. 6.2. Dynamic Modulus Test Svsteni—a dynamic test system meeting the requirements of Equipment Specification for the Simple Perftrmance Test System, Version 3.0. 6.3. Specimen DeJörmiiation MeasureniemU Devices—The specimen deformation measurement devices shall consist of four displacement transducers with a range of at least 0.25 mm, and a minimum resolution throughout the range of 0.10 pm. 6.4. Analysis Soflware—software capable of performing numerical optimization of non-linear equations. Note 1—The Solver Tool included in Microsoft Excel® is capable of performing the numerical optimization required by this practice. 7. HAZARDS 7.1. This practice and associated standards involve handling of hot asphalt binder, aggregates. and asphalt mixtures. It also includes the use of sawing and coring machinery and servo-hydraulic testing equipment. Use standard safety precautions, equipment, and clothing when handling hot materials and operating machinery. 8. STANDARDIZATION 8.1. Items associated with this practice that require calibration are included in the documents referenced in Section 2. Refer to the pertinent section of the referenced documents for information concerning calibration.AASHTO PP 96 pdf download.