haul compaction

A measure of the decrease in volume of a portion of soil or rock, from its loose haulage or stockpiled state to its compacted in place state, as it is placed into earth fill at the specified density. Its measure provides a means of computing the volume of material to be hauled in its loose state in order to fulfill a given volumetric requirement for earth fill at a specified density, or the volume of stockpile material that will be needed to fulfill that requirement.

The expected amount of haul compaction for a given soil can be expressed as a percentage of the soil volume in its loose haulage state. For example, a haul compaction factor of 14.8% indicates that the soil will shrink to occupy a volume 14.8% smaller than it occupied within the loose haul state. This value can also be expressed as a multiplication factor. For example, a soil with a haul compaction of 14.8% will have a multiplication factor of 0.852.

See also shrinkage and haul bulkage.