What is the primary function of the binder course in asphalt pavement?

The primary function of the binder course in asphalt pavement is to provide structural support and accommodate heavier loads. The binder course acts as an intermediate layer that sits beneath the surface layer and above the base course. Its design is focused on distributing the load from traffic across the underlying layers, reducing the stress that the pavement structure experiences.

This layer is crucial because it contributes significantly to the overall structural capacity of the pavement, allowing it to withstand the repeated stresses and strains from vehicles, which can include heavy trucks and machinery. Moreover, it enhances the durability and longevity of the entire pavement structure by helping prevent deformation and cracking that can occur under load.

While wear resistance, accommodating lighter loads, and moisture resistance are important characteristics in pavement design, they are secondary compared to the essential role of the binder course in load distribution and structural integrity. Overall, the binder course is designed to ensure that the pavement can support the traffic loads effectively over time.