ASTM D5195-21 PDF Download

ASTM D5195-21 is a standard test method that outlines the procedure for determining the density of soil and rock at depths below the surface using nuclear methods. The test involves the use of gamma radiation to calculate the wet density of the material under investigation. A gamma source and detector are placed at the desired depth in a bored hole, typically lined by an access tube.

The wet density is calculated by comparing the detected rate of gamma radiation with previously established calibration data. It is important to note that the test results can be reported in units other than the International System of Units (SI) without nonconformance to this standard.

The standard also provides guidance on significant digits and rounding of observed and calculated values, which should conform to the practices established in ASTM Practice D6026. These procedures are considered industry standard and representative of the significant digits that should generally be retained. However, it is acknowledged that material variation, purpose of data collection, and user objectives may require adjustment of significant digits. The standard does not address significant digit considerations for engineering design analysis methods.