![]() ![]() The soil sample taken for testing have to be completely oven dried.The weighing balance has to be checked before conducting the test. Entrapped air have to be eliminated completely before testing the sample. Two main reasons for error in the calculation are weighing inaccuracies and the presence of entrapped air.If present, they have to be broken down into the original form. The soil sample to be tested for specific gravity must be completely free from lumps.3)This certificate is invalid without appropriate signature and seal. Carefully fill the bottles with de-aired, distilled water up to the 500 ml mark. 2) Information under 'For', 'Project', are supplied by client. Clean the specific gravity bottle well and dry it. A specific gravity value greater than 3 will be shown by soils that have heavy substances. Specific Gravity of Water Specific Gravity of Soil Average Specific Gravity of Soil Remarks: 1) Certification applies to test samples only. If the soils consist of porous and organic materials, a specific gravity value of less than 2 will be obtained. The specific gravity of soil particles will come within the range of 2.65 and 2.85. Unless specified, the specific gravity values of the soil will be reported at 27-degree Celsius. Table.1: Observations and Calculations for Specific Gravity of Soil Sl. M 4 = mass of Pycnometer filled with water only. M 3= mass of the Pycnometer and soil and water, M 2= mass of the Pycnometer with dry soil The specific gravity of soil is determined using the relation: Take its mass (M 4).įig.2: Specific Gravity of Soil By Pycnometer Method Observations and Calculations for Specific Gravity of Soil Fill the Pycnometer with water completely upto the mark. Reapply the vacuum for about 5min till air bubbles stop appearing on the surface of the water.ħ. Fill the Pycnometer with water, about three-fourths full. Connect the Pycnometer to a vacuum pump to remove the entrapped air, for about 20 minutes for fine-grained soils and about 10 minutes for coarse-grained soils.Ħ. ![]() Unscrew the cap and add sufficient amount of de-aired water to the Pycnometer so as to cover the soil. Unscrew the cap and place about 200 g of oven dried soil in the Pycnometer. Mark the cap and Pycnometer with a vertical line parallel to the axis of the Pycnometer to ensure that the cap is screwed to the same mark each time.ģ. The specific gravity (Gs)of a material is the ratio of the mass of a unit volume of soil solids at a specific temperature to the mass of an equal volume of. Take its mass (M 1) to the nearest of 0.1 g.Ģ. ![]() Procedure for Specific Gravity of Soil by Pycnometer Methodġ.
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