What is the difference between the various asphalt pavement layers?
The base and binder courses of pavement are engineered using larger aggregate and thus provide the structural component of the pavement section. These courses are generally applied in thicker lifts than the top or surface courses. While adding some strength, the top or surface course is made with smaller aggregate and sand. This course primarily acts as a wearing surface while inhibiting the penetration of water through the surface.
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