Soil compaction is used to densify a soil by reducing the void space, or the amount of air, between soil particles. In other words, soil compaction occurs when soil particles are pressed together to reduce the space between them. The resulting highly compacted soils, with very few spaces, have a higher unit weight than non-compacted soils.
Compaction decreases the likelihood of settlement after a building, roadway, runway or parking lot is constructed which could result in premature pavement failure, costly maintenance or repairs. Soil compaction is a crucial part of the construction process as it provides a strong working platform. A strong soil base is the foundation and all other parts of the project depend on its strength and performance, both during construction and once the pavement structure is in place.