How much volume should a 4" mold for standard proctor tests contain?

The correct volume for a 4-inch mold used in standard Proctor tests is .0750 ± .0009 cubic feet. The Proctor test, which is designed to determine the optimum moisture content and maximum dry density of soil, requires specific mold dimensions to ensure consistency and standardization of results.

In this case, the specified mold size, which has a diameter of 4 inches and a height of 4.584 inches, leads to this particular volume. The volume calculation is critical as it directly impacts the weight of the soil sample used in the test, which in turn affects the test results. By adhering to specified measurements and volumes, testing can be replicated across different settings, ensuring reliable and comparable results.

Accurate understanding and maintenance of the mold volume are vital for construction material testing, as it influences the decisions made on soil compaction and suitability for use in foundations, embankments, and other engineering applications.