SPECIFIC GRAVITY OF SOIL DETERMINATION | Learning Technology

By | July 9, 2017

SPECIFIC GRAVITY OF SOIL DETERMINATION | Learning Technology

OBJECT OF EXPERIMENT


The object of the experiment is to determine the specific gravity of soil solid by using a Pycnometer.

 

STANDARD REFERENCE


IS 2720 (Part – III, Sec – 1), Determination of Specific Gravity for Fine Grained soil.

 

EQUIPMENTS


1. Pycnometer

2. Balance

3. Vacuum pump

4. Funnel

5. Spoon

 

THEORY


Specific Gravity of soil solid is the ratio of the weight of unit volume of soil solid at a stated temperature to the weight of the same volume of air-free distilled water at that temperature.

Calculate the Specific Gravity of soil solids using the following formula:

Therefore, SPECIFIC GRAVITY, GS = WS / [WS + (WA – WB)]

WHERE,

WS = Weight of sample of oven dry soil = WPS – WP

WPS = Weight of the pycnometer containing the dry soil,

WP = Weight of empty, clean and dry pycnometer,

WA = Weight of pycnometer filled with water,

W= Weight of pycnometer filled with water and soil,

 

PROCEDURE


1. First of all determine and record the weight of the empty clean and dry pycnometer, WP     

2. Place 10 gms of a dry soil sample (passed through the sieve 2mm) in the pycnometer. Determine and record the weight of the pycnometer containing the dry soil, WPS

3. Add distilled water to fill about half to three-fourth of the pycnometer. Soak the sample for 10 minutes.

4. Apply a partial vacuum to the contents for 10 minutes, to remove the entrapped air.

5. Stop the vacuum and carefully remove the vacuum line from pycnometer.

6. Fill the pycnometer with distilled (water to the mark), clean the exterior surface of the pycnometer with a clean, dry cloth. Determine the weight of the pycnometer and contents, W

7. Empty the pycnometer and clean it and then fill it with distilled water only (to the mark). Clean the exterior surface of the pycnometer with a clean dry cloth. Finally determine the weight of the pycnometer and distilled water, WA

8. Empty the pycnometer and clean it.

OBSERVATION TABLE


Tested Date :

Tested By :

Sample Number :

Sample Description :

SOIL SAMPLE TYPE
WP = Weight of empty, clean pycnometer in grams
WPS = Weight of empty pycnometer + dry soil in grams
WS = Weight of sample of oven-dry soil
WB = Weight of pycnometer + dry soil + water in grams
WA = Weight of pycnometer + water in grams
SPECIFIC GRAVITY, GS = WS / [WS + (WPS – WP)]

 

CONCLUSION


Finally write your own experience from from experiment

 

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