Alternatives Under Consideration

The structure and material properties are summarized in the following figure:

Design considerations

The following design considerations were provided:

The project has no grade restrictions, which allows the final grade to be raised.

The design life is 40 years.

The 40-year Traffic Index (TI) for this project is 12.

Strategies considered for this example

Overlay Only: Overlay existing project with new HMA and HMA-PM (HMA Type A with polymer modified binder).

Mill and Overlay: Mill off distressed AC and replace with new HMA and HMA-PM.

Full Depth Recycling: Use the appropriate FDR recycling strategy to rehabilitate the highway, and to place HMA layer with an HMA-PM surface.

Cold Central Plant Recycling (CCPR) with subgrade stabilization: Consider this option to address the weak subgrade and to recycle the existing RAP and AB materials in a cold central plant. Place an HMA layer (if required) on the CCPR with an HMA-PM surface.

The final decision should be based on a LCA and LCCA evaluation. The scope of this CalME example is to illustrate the process of using CalME and its related features to determine different appropriate structural designs for the traffic and environmental conditions.