What does "segregation" refer to in the context of asphalt paving?

In the context of asphalt paving, "segregation" specifically refers to the separation of coarse and fine aggregates within the asphalt mix. This phenomenon can occur during the mixing, transportation, or placement of asphalt, leading to an unbalanced distribution of materials. When segregation happens, it can result in areas with varying characteristics, affecting the durability and performance of the pavement.

Achieving a uniform mixture is crucial since it ensures the asphalt mat has consistent properties, which contribute to its strength and longevity. Segregation can lead to problems such as a rough surface, premature distresses, and ultimately, a shorter lifespan for the pavement.

Other options, while related to the general process of asphalt paving, do not accurately describe segregation. For instance, methods for laying asphalt at an even temperature or removing asphalt from damaged pavement are separate concerns and processes that do not involve the specific issue of aggregate separation. Similarly, techniques for preventing asphalt from hardening relate to mix preservation rather than mix integrity regarding aggregate distribution.