What is "segregation" in asphalt material?

Segregation in asphalt material refers specifically to the separation of aggregate sizes during production or placement. This phenomenon can occur when the materials are not handled properly, leading to the larger and smaller aggregate particles being distributed unevenly in the asphalt mix. This can adversely affect the properties of the finished product, such as its strength, durability, and overall performance.

When segregation happens, it can result in areas of the asphalt mat containing either too much of the coarse aggregates or too much fine aggregates, which can lead to issues such as cracking, raveling, and reduced load-bearing capacity. Proper mixing techniques and careful handling during transportation and placement are essential to prevent segregation and ensure a uniform asphalt mix that performs well under traffic loads.

The other options are related to different aspects of asphalt production but do not accurately define segregation. Mixing different asphalt grades or adding recycled materials pertain to the composition and sustainable practices in asphalt production, while variation in temperature addresses the thermal aspects of the mixing and laying process. Understanding segregation is crucial for maintaining high-quality asphalt pavements that meet design specifications and performance expectations.