![]() Mixing should be continued for about 15 to 30 min, till a uniform mix is obtained.Ĥ. ![]() Mix the sample thoroughly with distilled water in an evaporating dish or a glass plate to form a uniform paste. Take about 120g of the air-dried soil sample passing 425 micron IS sieve.ģ. The drop should be exactly 1 cm at the point of contact on the base. Adjust the drop of the cup of the liquid limit device by releasing the two screws at the top and by using the handle of the grooving tool or a gauge. ![]() Grooving tools of both standard and ASTM typesįig: Casagrande’s Apparatus Details and Tools Procedure of Liquid Limit Test on Soilġ.The liquid limit is the water content corresponding to N=25, as obtained from the plot. A semi-log plot is then drawn between log N and the water content (w). It flows to close the groove in just 25 blows in Casagrande’s liquid limit device.Īs it is difficult to get exactly 25 blows in a test, 3 to 4 tests are conducted and the number of blows (N) required in each test is determined. The liquid limit of a soil is the water content at which the soil behaves practically like a liquid, but has small shear strength. □ Reading time: 1 minute Determine Liquid Limit of Soil Specimen by Casagrande Method
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