complex modulus data, this project used the linear regression approach, presented in
Chapter 5. For each sample at a given test temperature and frequency, 10 cycles
consisting of 1000 points were analyzed to obtain the dynamic modulus and phase angle.
For interpretation purposes, within these 10 cycles, the axial strain history was assumed
to consist of a linear trend with a sinusoidal oscillation around the trend. All calculations
were performed using the SI system.
Analysis of Test Data Results
Test Data. One analysis file was obtained for each load frequency and testing
temperature. In this analysis file, the dynamic modulus in GPa and the phase angle in
degrees were obtained for the given test temperature and frequency. There were three
replicate specimens tested for each asphalt mixture. After all the dynamic modulus and
phase angle values were calculated for each specimen under the same test conditions, the
average value for both of these parameters was calculated. Tables 4-2 and 4-3 list the
average values for the three specimens for each asphalt mixture.
Table 4-2. Average dynamic modulus (IE*|) testing results
Mixture Temperature Frequency
0 C 1 Hz 4 Hz 10 Hz 16 Hz
Georgia Granite Mixtures
10 3457.54 4696.16 5577.41 6222.62
GAC1 25 931.93 1440.62 1788.84 1962.27
40 317.12 475.14 656.60 742.96
10 5289.30 7142.33 7983.76 8913.45
GAC2 25 1559.11 2308.10 2776.70 3318.24
40 535.77 787.74 1126.96 1313.66
10 5096.07 6797.11 7250.03 7660.00
GAC3 25 1606.35 2523.14 3079.15 3496.77
40 530.76 757.09 1109.68 1250.70
10 4594.94 6228.22 7302.91 7636.35
GAF1 25 1409.17 2107.13 2672.85 2950.80
40 401.02 635.50 867.07 1035.55
10 7142.75 9597.93 11966.62 12883.30
GAF2 25 2277.25 3201.00 4068.22 4630.38
40 535.97 905.80 1309.77 1574.02