Geology Reference
In-Depth Information
When the soil contains particles larger than the 4.75-mm sieve, ASTM
Test Method C 127 shall be used for the material retained on the 4.75-
mm sieve, and this test method shall be used for the material passing the
4.75-mm sieve. When the specific gravity value is to be used in calcula-
tions in connection with the hydrometer portion of ASTM Test Method D
422 (Chapter 10), it is intended that the specific gravity test be made on
the portion of the sample that passes the 2.00-mm (No. 10) sieve. [1]
Pycnometer (volumetric flask), with a minimum capacity of 250 mL,
preferably with a volume of 500 mL; the volume of the pycnometer must
be two to three times greater than the volume of the soil-water mixture
used during the deairing portion of the test (see Figure 6-1)
APPARATUS
AND SUPPLIES
Balance (with accuracy to 0.01 g)
Thermometer
Desiccator
Drying oven
Vacuum pump
Evaporating dish
Spatula
Mechanically operated stirring device (malt mixer) (see Figure 6-1)
Large beaker
Distilled water is used in this test method. This water may be
purchased and is readily available at most grocery stores; hereafter,
distilled water will be referred to as water.
Figure 6-1
Apparatus for
Determining Specific
Gravity of Soil
(Courtesy of Cheng Liu.)
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