What is the normal lift range in inches for attaining the specified density percentage when compacting structural fill?

The normal lift range for compacting structural fill is specifically within the 6 to 12 inches range, as this depth allows for the most effective compaction. When using heavy equipment for compaction, this lift range helps ensure that the material can be adequately compacted to achieve the desired density percentage. Lifts that are too thin may not allow for proper compaction, while those that are too thick can result in inadequate densification, leading to voids and reducing the overall structural integrity.

Maintaining this lift range also accounts for the types of materials being compacted and the method of compaction used. It is critical to achieve uniform density across the fill to prevent future settlement or failure in the structure that it supports. This practice aligns with industry standards to ensure stability and performance in construction projects.