Is it true that HMA should not be loaded into haul units in one large drop?

It is true that HMA should not be loaded into haul units in one large drop. Loading HMA in this manner can lead to several issues that adversely affect the quality and consistency of the mix. When HMA is dropped in a single large volume, it can cause segregations in the material, where the coarse and fine aggregates separate, leading to non-uniformity in the mix. This separation negatively impacts the performance of the asphalt once it is laid down, resulting in potential weaknesses in the pavement and diminishing its overall durability.

Additionally, a single large drop can create excessive pressure on the haul unit, which could lead to damage or deformation of the unit itself, potentially impacting future transports. By employing controlled loading techniques, such as smaller, multiple drops, the integrity of the mix is maintained, ensuring a more consistent product is delivered to the site for placement.