Tests on soil

Free swell Index

Code: This test is done as per IS: IS: 2720 (Part XL) – 1977.

Test Procedure:

• i) Take two specimens of 10g each of pulverised soil passing through 425µm IS Sieve and oven-dry.
• ii) Pour each soil specimen into a graduated glass cylinder of 100ml capacity.
• iii) Pour distilled water in one and kerosene oil in the other cylinder upto 100ml mark.
• iv) Remove entrapped air by gently shaking or stirring with a glass rod.
• v) Allow the suspension to attain the state of equilibrium (for not less than 24hours).
• vi) Final volume of soil in each of the cylinder should be read out.

Uses:

Used to determine the swell index of soil.