On an FDOT project, an approved gauge is typically used for which base?

The use of an approved gauge on an FDOT project is typically associated with the limerock base. This is because limerock is a material that requires careful quality control and uniformity in thickness to ensure proper compaction and performance under the roadway. The approved gauge helps in verifying that the layer meets the specifications laid out for limerock bases, which include density, moisture content, and thickness.

In contrast, other materials like sandy, clay, or gravel bases may follow different specifications or methods for assessment and compaction, which might not necessitate the same level of measurement as required for limerock. The focus on using an approved gauge specifically highlights the importance of compliance with FDOT standards for limerock materials in roadway construction.