Where is the proctor test determined and what does it establish?

• A. In a laboratory, establishing a density standard to be used on the roadway.
• B. On-site in the field, establishing a moisture content standard.
• C. In a lab, establishing a soil classification standard for highway design.
• D. In a laboratory, establishing a grading curve for asphalt.

Answer: (A)

The proctor test is performed in a laboratory to determine how densely soil can be compacted and at what moisture content this density is achieved. It yields the maximum dry density and the optimum moisture content, which together form the density standard used in roadway construction to guide field compaction. It isn’t done in the field, and it doesn’t establish soil classification or asphalt grading—those require different tests and objectives.