ASTM D6938

Full Name

ASTM D6938 – Standard Test Methods for In-Place Density and Water Content of Soil and Soil-Aggregate by Nuclear Methods (Shallow Depth)

Scope

ASTM D6938 outlines procedures for determining the in-place density and water content of soil and soil-aggregate materials using nuclear equipment. This standard is applicable for shallow depths.

Key test methods:

  • Direct transmission: measures density by measuring gamma radiation attenuation through the soil.
  • Backscatter: determines density and water content by measuring gamma radiation scattered back from the soil surface.
  • Backscatter/air-gap ratio: Combines backscatter and air-gap measurements for density determination.

Applications:

  • Quality control and acceptance testing of compacted soil and soil-aggregate mixtures.
  • Research and development projects.

Benefits:

  • Rapid, non-destructive testing.
  • Repetitive measurements for statistical analysis.

Limitations:

  • Assumptions about Compton scattering and material homogeneity.
  • Potential interferences from environmental factors.

ASTM D6938 Accredited Inspection Agency and Laboratory

Applied Testing & Geosciences, LLC is accredited for performing inspections and tests using the ASTM D6938 standard.

We understand the critical role of soil compaction in construction projects, and we are committed to delivering timely and informative reports to support your project success. Contact us today to learn more about our in-place density and water content testing services.

Resources

Keywords

in-place density; water content; soil; soil-aggregate; nuclear methods; shallow depth; gamma radiation; neutron radiation; backscatter; direct transmission; backscatter/air-gap ratio; compaction; quality control; acceptance testing; construction control; dry density; wet density; nuclear gauge; calibration; Compton scattering; homogeneity; safety; government regulations; reference count rates; statistical analysis; research and development; environmental factors; limitations; benefits; applications; equipment; procedures