A density test measures soil or material compaction to verify compliance with construction specifications and load-bearing requirements.

A density test is a field or laboratory procedure used to measure the in-place density of soil, aggregate, or fill materials on a construction site. The purpose of the test is to verify that materials have been properly compacted to meet project specifications and engineering requirements.

In construction, density testing is most commonly performed on subgrades, embankments, backfill, and pavement base layers. Test results are typically compared to a maximum dry density value established through laboratory methods such as the Proctor test. Common field testing methods include nuclear density gauges, sand cone tests, and rubber balloon tests.

From a quality control and compliance standpoint, density tests play a critical role in ensuring structural stability and long-term performance. Insufficient compaction can lead to settlement, cracking, and failure of pavements or foundations. Regular density testing helps contractors, engineers, and inspectors confirm proper workmanship and avoid costly rework.

Nuclear density gauges use small radioactive sources to measure compaction—operators must be specially trained and licensed to use them safely.

• Blower Door Test
• MDF (Medium Density Fiberboard)
• Operational Test