ASTM D5195-14e1 PDF Download

ASTM D5195-14e1 provides a nondestructive and rapid technique for determining the density of soil and rock at desired depths below the surface. It serves as an alternative to surface measurements conducted in accordance with Test Method D6938.

This test method is particularly useful for informational and research purposes, and should only be used for quality control and acceptance testing when correlated with other accepted methods such as Test Method D2937. The non-destructive nature of the test method enables repetitive measurements at a single test location for statistical analysis and monitoring changes over time.

The fundamental assumptions of this test method are that Compton scattering and photoelectric absorption are the dominant interactions of the gamma rays with the material being tested. It is important to note that the quality of the results obtained from this test method relies on the competence of the personnel performing it, as well as the suitability of the equipment and facilities used. Compliance with Practice D3740, which evaluates factors affecting reliable results, is recommended but does not guarantee reliable results on its own.

The test method involves placing a gamma source and a gamma detector at the desired depth in a bored hole lined by an access tube. The density of the material under test, in mass per unit volume, is calculated by comparing the detected rate of gamma radiation with previously established calibration data. However, a precision statement has not been developed for this standard at this time, so it should not be used for acceptance or rejection of material for purchasing purposes unless correlated with other accepted ASTM standards.

All observed and calculated values obtained using this test method should conform to the guidelines for significant digits and rounding specified in Practice D6026. The procedures used to collect, record, and calculate data in this standard are considered industry standard and represent the significant digits that should generally be retained. However, it's important to note that these procedures do not consider material variation, the purpose for obtaining the data, or any special considerations for the user's objectives. Therefore, the significant digits reported may be adjusted to align with these considerations, and it is beyond the scope of this standard to determine the significant digits used in analysis methods for engineering design purposes.