AASHTO PP 62-10 pdf free download

AASHTO PP 62-10 pdf free download.Developing| Dynamic Modulus Master Curves forl H lot Mix Asphalt (HMA).
2. REFERENCED DOCUMENTS
2.1. AASHTO Standards:
• PP 60, Preparation of Cylindrical Performance Test Specimens Using the Superpave Gyratory
Compactor (SGC)
• R 35, Superpave Volumetric Design for Hot Mix Asphalt (1-IMA)
• T 342, Determining Dynamic Modulus of Hot Mix Asphalt (HMA)
• Mechanistic-Empirical Pave,n em Design Guide (ME PDG)
3. TERMINOLOGY
3.1. dynamic modulus master curve—a composite curve constructed at a reference temperature by shifting dynamic modulus data from various temperatures along the “log frequency” axis.
3.2. reduced frequencv—t he computed frequency at the reference temperature, equivalent to the actual loading frequency at the test temperature.
3.3. reference temperature—the temperature at which the master curve is constructed.
3.4. .chi/ifactor—the 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 HMA. It involves collecting dynamic modulus test data at specified temperatures and loading rates, then manipulating the test data to obtain a continuous function describing the dynamic modulus as a function of frequency and temperature.
5. SIGNIFICANCE AND USE
5.1. Dynamic modulus master curves can be used for mixture evaluation and for characterizing the modulus of HMA for mechanistic-empirical pavement design.
6. APPARATUS
6.1. Specimen Fabrication Equipment—For fabricating dynamic modulus test specimens as described in PP 60.
6.2. Dynamic Modulus Test System—Meeting the requirements of TP 62.
6.3. Analysis Software—Capable of performing numerical optimization of non-linear equations. Note 1—The “Solver” tool included in Microsoft Excel k 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 HMA. 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 arid operating machinery.
8. STANDARDIZATION
8.1. Items associated with this practice that require calibration or verification are included in the documents referenced in Section 2. Refer to the pertinent section of the referenced documents for information concerning calibration or verification.
9. DYNAMIC MODULUS TEST DATA
9.1. Test Specimen Fabrication:
9.1.1. Prepare at least two test specimens at the target air void content ±0.5 percent and with the aging condition in accordance with PP 60. Use Table I to select an appropriate number of specimens based on the uncertainty that can be tolerated in the analysis.
Note 2 -The coefficient of variation for properly conducted dynamic modulus tests is approximately 13 percent. The coefficient of variation of the mean dynamic modulus for tests on multiple specimens is given in Table 1.11.1.2. Measured dynamic modulus and phase angle data for each specimen at each temperature/frequency combination. 11.1.3. Average measured dynamic modulus and phase angle at each temperature/frequency combination. 11.1.4. Coefficient of variation of the measured dynamic modulus data at each temperature/frequency combination. 11.1.5. Standard deviation of the measured phase angle data at each temperature/frequency combination. 11.1.6. Air voids, binder content, VMA, and VFA of each specimen tested. 11.1.7. Average air voids, average binder content, average VMA, and average VFA for the specimens tested.AASHTO PP 62-10  pdf download.