- 10 years agoFavorite Answer
The Proctor and modified Proctor compaction test are used to determine the maximum achievable density of soils and aggregates.
The test consists of compacting the soil or aggregate to be tested into a standard mould using a standardized compactive energy at several different levels of moisture content. The maximum dry density and optimum moisture content is determined from the results of the test.
A minimum standard or modified proctor density is often specified in the foundation of roadways, buildings, and etc