SPECIFIC GRAVITY TEST FOR SOILS.


SPECIFIC GRAVITY TEST FOR SOILS.
 ( IS : 2720 – PART – 3 )

Object:

To determine the specific gravity of soil fraction passing 4.75 mm sieve by density bottle. 

Apparatus:

1) Density bottle of 50ml / 100ml capacity.
2) Balance sensitive to 0.01g.
3) Wash bottle with deaired distilled water
4) Vacuum source

Procedure:

To clean and dry the density bottle, wash it thoroughly with distilled water and allow it to drain. Weigh the empty cleaned bottle (W1) accurate to 0.01g with its stopper. Take about 10 to 20 grams of oven dried soil sample; find the weight (W2) of the bottle and the soil, with the stopper. Put about 10ml of deaired distilled water in the bottle, so that the soil is fully soaked. Leave it for a period of 2 to 10 hours. Add more distilled water so that the bottle is about half full. Remove the entrapped air by subjecting the contents to a partial vacuum, then find out the weight (W3). Clean the bottle thoroughly and fill it with distilled water and weighed (W4). Temperature should be maintained 270C through out the test.

Calculations:

                                                              (W2 – W1)
Specific gravity of the soil = G =
                                                      (W2 – W1) – (W3 – W4)

Where,       W1 = weight of the empty bottle with stopper.
                    W2 = weight of the bottle + Soil sample with stopper.
                    W3 = weight of the bottle + sample + water with stopper.
                    W4 = weight of the bottle + water with stopper.


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