6000
a. 5000
u 4000
3000
E .0 DFAA
O 2000 O Project
Q 2000
SO0 A Granite
OWR
g 1000
0 1000 2000 3000 4000 5000 6000
Predicted Dynamic Modulus, IE*I (MPa)
Figure 4-28. Measured vs. predicted dynamic modulus for fine aggregate angularity
mixtures (FAA), Superpave project mixtures (Project), Granite mixtures
(Granite), and Whiterock mixtures (WR) at a test temperature of 400 C and a
testing frequency of 4 Hz.
The procedure developed by Pellinen and Witczak (2002) for obtaining predicted
master curves was used for all mixtures tested at more than two temperatures. The results
showed that further testing at higher and lower temperatures would help in better defining
the tails of the predicted master curves.
Finally, the predictive regression equation developed by Witzcak et al. (2002) was
used to predict dynamic modulus values for most of the mixtures tested. The results
showed that dynamic modulus predictions using DSR-based viscosity measurements
result in conservative predictions of the dynamic modulus. Therefore, it is recommended
that viscosity input values for the predictive equation be obtained from the DSR test, in