What is a Proctor test used for in soil compaction?

What is a Proctor test used for in soil compaction?

• A. To measure soil shear strength.
• B. To determine maximum dry density and optimum moisture content for compacted fill.
• C. To identify soil color.
• D. To assess soil permeability.

Answer: (B)

The Proctor test is used to determine how densely soil can be compacted and at what moisture level. By compacting soil at several moisture contents in a mold with a standard amount of energy, you build a curve of dry density versus moisture content. The highest point on that curve is the maximum dry density, and the moisture content corresponding to that peak is the optimum moisture content for field compaction. This information guides how much moisture to add and how much compaction effort to apply to achieve the desired density and stability in compacted fills. Variants exist, like the Standard and Modified Proctor tests, which use different energy levels to simulate different construction scenarios.

The Proctor test is used to determine how densely soil can be compacted and at what moisture level. By compacting soil at several moisture contents in a mold with a standard amount of energy, you build a curve of dry density versus moisture content. The highest point on that curve is the maximum dry density, and the moisture content corresponding to that peak is the optimum moisture content for field compaction. This information guides how much moisture to add and how much compaction effort to apply to achieve the desired density and stability in compacted fills. Variants exist, like the Standard and Modified Proctor tests, which use different energy levels to simulate different construction scenarios.