TRANSCRIPT FROM VIDEO:
There are several approaches to evaluating RAP in balanced mix design.
Balanced mix design considers the functional characteristics of the mix and seeks a compromise between competing properties in order to meet the required specifications for roadway performance. For example, a balanced mix design will look to offset the impact of stiffness compared to softness and the impact of those attributes on performance parameters such as rutting, cracking, or fatigue resistance.
When designing a balanced mix, labs test samples for different properties. Examples of tests can include the Hamburg Wheel Tracking Test, which measures rutting resistance, and the IDEAL-CT, which measures cracking potential.
These results are compared to historic roadway performance metrics or established department of transportation specifications to determine the viability of the mix under analysis.