What does the Speedy Moisture Test primarily determine?

The Speedy Moisture Test primarily determines moisture content in soil. This test is designed to provide a quick and relatively accurate measurement of the amount of water present in a soil sample. It employs a chemical reaction between soil moisture and calcium carbide, which creates acetylene gas that can be measured.

Understanding moisture content is crucial in earthwork and construction because it significantly impacts soil behavior, stability, compaction, and strength. Maintaining the correct moisture level is essential for achieving optimal compaction during construction activities. Therefore, the Speedy Moisture Test serves as an essential tool for engineers and contractors in assessing and managing soil conditions effectively.

Other options relate to characteristics of soil but do not directly relate to what the Speedy Moisture Test measures. Soil density refers to the mass of soil per unit volume, soil structure denotes the arrangement of soil particles, and air voids pertain to the empty spaces within the soil. These aspects might influence or be affected by moisture, but they are not the focus of the Speedy Moisture Test.