Count the number of drops (N) required to close the groove.Lift and drop the cup by turning the crank at a rate of 2 drops per second until the two halves of the soil pat come in contact at the bottom of the groove along a distance of 1/2 inch or 13 mm.Verify that no crumbs of soil are present on the base or the underside of the cup.Cut a 2mm groove at the center line of the soil cup using the grooving tool.Cover the evaporating dish with a wet towel (or use other means) to retain the moisture in the soil.Keep the unused soil in the mixing/storage dish.Take care to eliminate air bubbles from the soil pat, but form the pat with as few strokes as possible.Place a portion of the soil paste in the Casagrande’s cup and spread it smoothly using a spatula so that the maximum depth is about 10mm.Adjust its water content until the constancy requires about 25 to 35 blows of the Casagrande's liquid limit device to close the groove.Put about 250g of air-dried soil sample through a 425µm sieve into an evaporating dish and mix thoroughly adding enough distilled water to form a uniform paste.Calibrate the drop of the cup, using the end of the grooving tool not meant for cutting, so that there is consistency in the height of the drop.Weigh each of the three moisture cans (W₁).
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