This method covers determination of the specific gravity of soils composed of particles smaller than the 4.75-mm (No. 4) sieve by means of a pycnometer. When the soil is composed of particles larger than the 4.75-mm (No. 4) sieve, the method outlined in AASHTO T 85 shall be followed. When the soil is composed of particles both larger and smaller than the 4.75-mm (No. 4) sieve, the sample shall be separated on the 4.75-mm (No. 4) sieve, the appropriate test method should be used on each portion, and a weighted average should be calculated.
AASHTO T 100-14
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Standard Method of Test for Specific Gravity of Soils (ASTM Designation: D854-00)
American Association of State Highway and Transportation Officials , 2014