Fall cone test plastic limit10/31/2023 The vertical clamp is then released allowing the cone to penetrate into soil paste under its own weight for 5 seconds.The penetrometer is so adjusted that the cone point just touches the surface of the soil paste in the cup and the initial ready is to be taken.Finally the wet soil is leveled up to the top of the cup and placed on the base of the cone penetrometer apparatus.Then the wet soil paste is transferred to the cylindrical cup of cone penetrometer apparatus, ensuring that no air is trapped in this process.Distilled water is mixed to the soil thus obtained in a mixing disc to form a uniform paste.of air dried soil from thoroughly mixed portion of material passing 425 micron IS sieve is obtained. If clods are there in soil sample then it is broken with the help of wooden mallet. Equipment & ApparatusĪfter receiving the soil sample it is dried in air or in oven (maintained at a temperature of 60 0C). IS : 2720(Part 5)-1985- Methods of test for soils : Determination of liquid and plastic limit. For determination of the liquid limit of soil using cone penetrometer.
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