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DETERMINATION OF FREE SWELL
INDEX OF SOILS
PRESENTED BY- DAVINDERPAL SINGH
ASSISTED BY- AKHILESH KAUSHAL
ABOUT TEST
 IT IS A TEST OF SOIL AND COMES UNDER
SOIL MECHANICS TESTS. (GEOTECHNICAL
ENGINEERING)
 CODE USED IS:2720 (PART 40)-1977
APPARATUS
 IS SIEVE 425 micron (IS:460)
 100 ml CAPACITY FLASK (IS:878) TWO ARE
REQUIRED
 STIRRER (THIN ROD, CAN BE GLASS ROD)
 OVEN
 ENAMEL TRAY
 WEIGHING BALANCE (accurate upto 0.01 g)
PROCEDURE
 Soil sample upto 500 gram is taken from desired site and kept
in oven for 24 hours at (100-110)0C, so that sample becomes
oven dried.
 Then sample is sieved through 425 micron IS SIEVE and
sample passed is taken.
 Sample finer than 425 micron is taken in two flask of 100 ml
capacity, 10 gram in quantity in each flask.
Determination of free swell index of soils
Determination of free swell index of soils
Determination of free swell index of soils
PROCEDURE
 In first flask already filled with 10 gram oven dried sample
finer than 425 micron, kerosene oil is added upto 100 ml
mark.
 In second flask which is also filled with 10 gram oven-dried
sample finer than 425 micron, distilled water is added upto
100 ml mark of flask.
 Then sample are stirred well by a stirrer to remove entrapped
air in it.
Determination of free swell index of soils
PROCEDURE
 Then two flasks are kept ideal for not less than 24 hours
time allowing sample to swell and settle.
 Atleast Three Readings are taken and their average is
given as a result.
Determination of free swell index of soils
FORMULA
RESULT
 FREE SWELL INDEX=((VW  VK) / (VK))*100 = ((9 -8) / (8))*100 =
12.5%
 TAKE FURTHER TWO READINGS AND TAKE THEIR
AVERAGE.

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Determination of free swell index of soils

  • 1. DETERMINATION OF FREE SWELL INDEX OF SOILS PRESENTED BY- DAVINDERPAL SINGH ASSISTED BY- AKHILESH KAUSHAL
  • 2. ABOUT TEST IT IS A TEST OF SOIL AND COMES UNDER SOIL MECHANICS TESTS. (GEOTECHNICAL ENGINEERING) CODE USED IS:2720 (PART 40)-1977
  • 3. APPARATUS IS SIEVE 425 micron (IS:460) 100 ml CAPACITY FLASK (IS:878) TWO ARE REQUIRED STIRRER (THIN ROD, CAN BE GLASS ROD) OVEN ENAMEL TRAY WEIGHING BALANCE (accurate upto 0.01 g)
  • 4. PROCEDURE Soil sample upto 500 gram is taken from desired site and kept in oven for 24 hours at (100-110)0C, so that sample becomes oven dried. Then sample is sieved through 425 micron IS SIEVE and sample passed is taken. Sample finer than 425 micron is taken in two flask of 100 ml capacity, 10 gram in quantity in each flask.
  • 8. PROCEDURE In first flask already filled with 10 gram oven dried sample finer than 425 micron, kerosene oil is added upto 100 ml mark. In second flask which is also filled with 10 gram oven-dried sample finer than 425 micron, distilled water is added upto 100 ml mark of flask. Then sample are stirred well by a stirrer to remove entrapped air in it.
  • 10. PROCEDURE Then two flasks are kept ideal for not less than 24 hours time allowing sample to swell and settle. Atleast Three Readings are taken and their average is given as a result.
  • 13. RESULT FREE SWELL INDEX=((VW VK) / (VK))*100 = ((9 -8) / (8))*100 = 12.5% TAKE FURTHER TWO READINGS AND TAKE THEIR AVERAGE.