Is it acceptable for haul units to be loaded with HMA in a single large drop?

Loading hot mix asphalt (HMA) in a single large drop is not acceptable due to the potential negative impact on the material's quality and consistency. When HMA is loaded in one significant drop from the truck, it can create segregation within the mix. Segregation occurs when the heavier aggregate particles tend to separate from the lighter matrix or asphalt binder, leading to an uneven distribution of materials.

This uneven distribution can result in inadequate performance of the asphalt layer, including issues like reduced durability, poor compaction, and an overall ineffective firm parameter necessary for a quality paved surface. The integrity of the pavement can be compromised, leading to premature distresses such as cracking. Therefore, it is crucial for the loading process to be controlled and methodical, ensuring an even and uniform distribution of materials within the haul unit. This ensures the mix remains consistent and can perform as intended once laid down on the roadway.