The proper compaction of soil is best achieved by which method?

The proper compaction of soil is indeed best achieved by using the right amount of moisture. This is because moisture content significantly affects the soil's density and compaction capabilities. When soil is at an optimal moisture level, the particles can move more freely, allowing them to settle closer together during compaction. This results in higher density and better stability of the soil structure.

When soil is too dry, the particles tend to resist compaction because they cannot slide past each other effectively. Conversely, when soil is overly wet, it may become saturated and lose its load-bearing ability as the water fills the void spaces between particles. Therefore, achieving the correct moisture content is essential for maximizing the effectiveness of any compaction method.

While heavy machinery, rolling, and additives can contribute to compaction, they are most effective when used alongside proper moisture management. Heavy machinery can compress soil, but without the right moisture, the desired compaction may not be realized. Rolling can help increase density, but again, the moisture level dictates the effectiveness of this method. Additives can enhance stability or reduce moisture content but are secondary to the fundamental requirement of achieving optimal moisture in the soil for compaction.