AASHTO T 100-15 (2019) PDF Download

AASHTO T 100-15 (2019) is a standard method for determining the specific gravity of soils that consist of particles smaller than the 4.75-mm (No. 4) sieve. This is done using a pycnometer, which is a vessel used to measure the volume of an object. However, if the soil contains particles larger than the 4.75-mm sieve, a different method outlined in T 85 should be followed.

In case the soil includes particles both larger and smaller than the 4.75-mm sieve, the sample should be separated using the sieve and the appropriate test method should be applied to each portion separately. Finally, a weighted average should be calculated to determine the specific gravity of the soil sample.