Which types of aggregates are typically used in asphalt mixtures?

The answer is based on the fact that asphalt mixtures require aggregates that provide strength, stability, and durability to the pavement. Crushed stone, gravel, and sand are commonly used because they interlock well and create a solid structure when bound with asphalt. Crushed stone, being sharp and angular, allows for better compaction and resistance to deformation under load. Gravel also adds to the stability, while sand fills gaps between larger aggregates, creating a well-graded mixture that enhances the pavement's performance.

In contrast, while materials like recycled plastics and rubber can indeed be used in asphalt mixtures to enhance certain properties, they are not traditional aggregates and do not serve the same primary function as the typical aggregates. Clay and silt particles can adversely affect the mixture's performance by reducing stability and increasing the risk of water damage. Lastly, limiting the use of processed materials ignores the benefits that can be achieved through the incorporation of a variety of aggregate types, including both natural and manufactured materials, for optimal performance and sustainability in asphalt paving.