Example N01.4: Use Aggregate Subbase

In this subsection, the alternative of introducing an aggregate subbase before placing aggregate base is examined. Specifically, an AS-Class 1 layer of 1.0 ft thick is placed between AB and SG. The HMA thickness required is expected to be reduced.

The screen shot of the pavement structure and the Monte Carlo simulation results are shown below.

As shown above, a 0.95 ft of AS-Class 1 can reduce the HMA thickness required by 0.10 ft (from 1.05 ft to 0.95 ft).