What testing method is commonly used to check soil compaction?

The Proctor test is commonly employed to assess soil compaction because it measures the relationship between moisture content and the density of the soil. This test helps determine the optimal moisture content at which soil achieves its maximum density, which is critical in construction and engineering projects.

By compacting soil samples at varying moisture levels, the Proctor test establishes a curve that depicts the maximum dry density attainable at specific moisture content. This information is essential for engineers to ensure that soil is compacted adequately to support structures, foundations, and roadways, thereby preventing issues such as settlement or instability.

Because the Proctor test directly relates to the compaction process, it serves as a standard in the industry for assessing how well the soil has been compacted on-site. This makes it the go-to method for ensuring that the soil conditions meet design specifications for various civil engineering applications.