What role do aggregates play in asphalt mix?

Aggregates play a crucial role in asphalt mix by providing structural support and strength. In asphalt pavements, aggregates are the main component and can constitute around 90-95% of the total mixture. Their mechanical properties are essential for the performance and durability of the pavement.

The aggregates contribute to the stability of the asphalt mix, allowing it to resist deformation under heavy loads. They also disperse loads applied to the surface, preventing the asphalt binder from being overly stressed. Moreover, a well-graded aggregate blend enhances interlocking, which improves the mix's overall performance.

While aggregates may contribute to aesthetic qualities in some special mixes, their primary purpose is not for visual appeal. They do not serve simply as fillers, as their presence is vital for the mechanical integrity, and they do not play a direct role in temperature regulation within the asphalt mix. The heat retained by the binder is influenced by other factors, but aggregates themselves do not inherently regulate temperature.