ASTM D7928-16,Standard Test Method for Particle-Size Distribution (Gradation) of Fine-Grained Soils Using the Sedimentation (Hydrometer) Analysis.
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ASTM D7928-16 covers the quantitative determination of the distribution of particle sizes of the fine-grained portion of soils.
ASTM D7928-16 can be used to evaluate the fine-grained fraction of a soil with a wide range of particle sizes by combining the sedimentation results with a sieve analysis resulting in the complete gradation curve.
The procedures used to specify how data are collected/recorded and calculated in the standard are regarded as the industry standard. In addition, they are representative of the significant digits that generally should be retained.
Terminology
3. 1 Definitions:
3.1.1 For definitions of common technical terms used in thistandard, refer to Terminology D653
3.2 Definitions of Terms Specific to This Standard
3.2. 1 reduced sample, n-the minus 3/8-in.(9.5-mm) sieveor finer material that has been separated from the sample andthen worked to reduce the mass while still having sufficient quantity to meet the minimum mass requirements of Table I.
3.2.2 sample, n–material collected without limitation onthe total mass or size range of particles meeting the minimum mass requirements provided in Table I.
3.2.3 sedimentation sample, n-the minus No. 10 (2.0-mm) finer material that is separated from the reduced sample using the separation sieve from which the sedimentation specimen and water content are obtained.
PS:ASTM d7928-16 has been replaced by ASTM d7928-17. But I can only find this version at present.
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