What is segregation in asphalt paving?

Segregation in asphalt paving refers to the uneven distribution of aggregate sizes within the asphalt mixture. This phenomenon occurs when the larger aggregates separate from the finer particles during the mixing, transportation, or placement processes. When segregation happens, it can lead to areas with inconsistent properties in the finished pavement, affecting its durability and performance.

A uniform distribution of aggregate is critical in achieving a high-quality asphalt mix, as it ensures that the material will perform consistently under traffic loads. Uneven temperature during mixing can impact the workability of the pavement, but it does not directly relate to the concept of segregation. Extra material after compaction may be a concern for certain project specifications, but again, does not define segregation itself. Understanding segregation is essential for paving professionals to ensure that the asphalt mix used in construction delivers the intended strength and longevity.