Which two types of asphalt mixes are commonly used in road construction?

The identification of dense-graded asphalt and open-graded asphalt as commonly used types of asphalt mixes in road construction is accurate for several reasons rooted in their properties and applications.

Dense-graded asphalt is characterized by a well-graded mixture of aggregate sizes, leading to a dense packing of the materials that provides good structural support, durability, and resistance to deformation. This type of mix is typically used for surface and lower layers of pavements because of its ability to withstand traffic loads and reduce water infiltration.

Open-graded asphalt, on the other hand, contains larger aggregate sizes with more voids, allowing for improved drainage and reduced hydroplaning. This type of mix is often used for specific scenarios, such as in surface layers of roads where drainage is crucial, or in noise-reducing pavements.

Both types of mixes play essential roles in the overall performance and longevity of roadways, depending on the specific design and environmental needs. Their use is widespread in road construction because they contribute to safety, longevity, and the optimization of asphalt materials for different conditions.