What is NOT a common form of segregation?

Segregation in hot mix asphalt (HMA) refers to the separation of different sized particles within the mix, which can lead to various pavement performance issues. Understanding the types of segregation can help inspectors identify and address potential problems.

Truck end segregation happens at the end of the truck during the loading process. It is often caused by the sudden unloading or movement of the material, leading to the coarser aggregate settling to the bottom.

Centerline segregation occurs when there's a difference in the material placement directly along the centerline of the roadway. This type can be a result of uneven paving or issues with the paving machine that affect how the asphalt is distributed on the road.

Random segregation is not associated with any specific pattern or location. It can happen through a variety of mechanisms, such as changes in temperature, handling, or mixing processes, but does not follow a consistent format.

Undertone segregation is not typically recognized as a common form of segregation in asphalt mixtures. It may refer to a less-defined or less immediately visible phenomenon but lacks the clear definition and identification of the other forms of segregation listed. This is why identifying it as “NOT a common form of segregation” is appropriate, as it is not widely discussed or defined in the