2.4 Power Model
The power model is often used to fit to describe the master curve:
D() = Do +Dm (2.32)
where
D( ) = Creep compliance at reduced time, ,
= Reduced time
Do, D1, m = Power model parameters
The m-value describes the linear part of the master curve on the log creep
compliance-log time scale. Figure 2.5 shows the power model and the parameters in the
master curve.Do represents the elastic portion of the creep compliance. Christensen and
Anderson (15) found that the maximum stiffness for all asphalts is 3GPa. Therefore, the
minimum Do is:
DO = 1/3GPa = 3.33 x 10l0Pa (2.33)
LOG T D() = Do + D,"
D(f)
1 LOG 4
Figure 2.5 Power Model