What is the verification criterion for Maximum Density (Proctor)?

What is the verification criterion for Maximum Density (Proctor)?

• A. 4.5 pcf
• B. 4.0 pcf
• C. 5.0 pcf
• D. 4.8 pcf

Answer: (A)

The idea being tested is how you verify that you’ve achieved the Proctor maximum density during compaction. In a Proctor test, you determine the maximum dry density you can reach at the optimum moisture content and use that as the standard to judge field compaction. The verification criterion in this context is a fixed density value that serves as the benchmark for declaring successful attainment of the Proctor maximum density. Four and a half pounds per cubic foot is the stated benchmark in this item, so reaching this density (or meeting the related tolerance specified by the test method) shows that the Proctor maximum density criterion is satisfied. The other numbers don’t match the given verification benchmark for this question, so they aren’t the correct standard to use here.

The idea being tested is how you verify that you’ve achieved the Proctor maximum density during compaction. In a Proctor test, you determine the maximum dry density you can reach at the optimum moisture content and use that as the standard to judge field compaction. The verification criterion in this context is a fixed density value that serves as the benchmark for declaring successful attainment of the Proctor maximum density. Four and a half pounds per cubic foot is the stated benchmark in this item, so reaching this density (or meeting the related tolerance specified by the test method) shows that the Proctor maximum density criterion is satisfied. The other numbers don’t match the given verification benchmark for this question, so they aren’t the correct standard to use here.