Page 219 - MODELING OF ASPHALT CONCRETE

VEPCD Modeling of Asphalt Concr ete with Gr owing Damage 197

FIGURE 7-23 Effects of temperature and loading rate on the apparent C versus strain
relationship: (a) 25°C, (b) 40°C, and (c) 55°C.

occurs between 0.4 to 0.6% strain. The peak stress in the stress-strain curve is found to
be between 1 and 1.6% strain, regardless of the temperature and strain rate.
A comparison of Figs. 7-22 and 7-23 reveals that the behavior of asphalt concrete
in compression at high temperatures can be divided into four zones, as shown in
Figs. 7-22(c) and 7-23(c). In the first zone, the viscoelasticity and the flow of the
binder dominate the behavior of asphalt concrete and, as a result, the stress versus
pseudostrain curve shows the softening behavior. In this zone, aggregate particles