Specific Gravity Test of Soil

  • Laboratory Test:

  1. Specific Gravity Test
  2. Natural Moisture Content.
  3. Complete Grain Size Analysis.
  4. Atterberg Limits.
  5. Direct Shear Test.
  6. Unconfined Compression Test.
  7. Consolidation Test.
  • Specific Gravity Test:

The specific gravity test of soil particles (Gs) is defined as the ratio of the mass of giving the volume of soil particles to the mass of an equal volume of water at 4.The specific gravity of a solid for most natural soils falls in general range of 2.60 to 2.80. To determine the specific gravity of soil sample, 25 grams of over dried soil sample is thoroughly pulverized and is placed in a calibrated psychomotor. The mixture is then boiled thoroughly in order to eliminate all the air bubbles. More water is then added to the mixture till it over-night, The temperature is then recorded and the bottle is weighed.

  • The specific gravity Gs is given by:


Gt = Specific gravity of water at TOC

Ws = The weight of over dry soil (25gms.)

W1 = Weight of flask + Soil + water

W2 = Weight of flask + water

  • Description of soil composition:

The following terms are used in this report for the description of soil composition:

Trace fine sand: 1 to 10% fine stand.

Little silt            : 11 to 20% silt.

Some clay          : 20 to 35% clay.

Sandy silt           : 35 to 50% sand & 50 to 70% silt.

Clayey silt          : 35 to 50% sand & 50 to 70% silt.

Silty sand           : 35 to 50% silt & 50 to 70 sand.


Read More: SPT – Standard Penetration Test

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