How is a compaction curve used in field operations for pavement or earthwork?

How is a compaction curve used in field operations for pavement or earthwork?

• A. It charts soil color changes with moisture to determine material suitability.
• B. It records moisture content over time to schedule compaction equipment.
• C. It plots soil shear strength versus density to predict failure.
• D. It shows dry density versus moisture content to guide moisture adjustments and reach target density.

Answer: (D)