What does the term "segregation" refer to in paving?

The term "segregation" in the context of asphalt paving primarily refers to the separation of fine and coarse aggregates. This phenomenon can lead to significant issues in the quality and performance of the paved surface. When segregation occurs, the finer aggregates may settle away from the coarser ones, resulting in an uneven distribution of materials. This can affect the strength, durability, and uniformity of the asphalt mat, leading to potential problems such as raveling, cracking, and reduced lifespan of the pavement.

Understanding segregation is critical for ensuring quality control during the mixing and application phases of asphalt paving. By monitoring the aggregate distribution and taking steps to prevent segregation, paving crews can maintain the integrity and performance of the asphalt mixture, ultimately leading to a smoother and more durable surface.