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Determination of free swell index of soils

D
Davinderpal Singh

This document describes the procedure for determining the free swell index of soils. The test involves taking a soil sample, drying it in an oven, sieving it to remove particles larger than 425 microns, and placing 10g of the remaining soil in each of two 100ml flasks. Kerosene is added to one flask and distilled water to the other, and both are stirred and allowed to settle for at least 24 hours. The free swell index is calculated as the percentage increase in volume of the soil-water mixture over the soil-kerosene mixture. At least three readings should be taken and averaged to obtain the final result.

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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.