Which is the primary factor that determines if 97% density using the Modified Proctor Test will be achieved?

The primary factor that determines if 97% density using the Modified Proctor Test will be achieved is moisture content. The Modified Proctor Test is designed to establish the optimum moisture content for compacting soil to achieve maximum density. When the soil is at its optimum moisture content, the particles are able to achieve a closer arrangement, allowing for greater compaction. At this point, the soil can be compacted to its maximum dry density, which is essential for various construction applications.

Soil type, compaction method, and hammer weight do play roles in the overall process of compaction but they are influenced by, and contingent upon, the moisture content of the soil. For instance, different soil types may respond differently to variations in moisture content, but without the right moisture level, achieving the target density becomes difficult, regardless of the other factors. Therefore, understanding and controlling moisture content is crucial for effectively using the Modified Proctor Test to reach a specified density.