What characteristic defines the base layer of asphalt pavement?

The base layer of asphalt pavement is characterized by its role in providing significant structural strength. This layer, often referred to as the base course, is crucial for supporting the weight of traffic and distributing loads to the underlying subgrade. Its design typically involves using larger aggregates and materials specifically engineered to resist deformation and failure under loads, which enhances the overall durability and longevity of the pavement structure.

In addition to load distribution, the base layer also helps in drainage, preventing moisture buildup that can damage the pavement. This characteristic is essential for maintaining the integrity of the entire paving system over time, particularly in areas subjected to heavy traffic or adverse weather conditions. The correct understanding of the base layer's function is vital for effective pavement design and maintenance strategies.