Determination of liquid limit of soil -
- It is determined by A. Cassandra's liquid limit of apparatus which is consist of a brass cup, which can be raised and lowered operated by a handle. The adjusting screws controls the height of full. There are two types of grooving tool (a) Casagrande (British Standard) tool for Clayey soil (b) satm tool in case of Sandy soil. About 100 gm of the soil sample passing through 425 micron IS sieve is taken in a porcelain dish.
Some quantity of distilled water is mixed thoroughly to form a paste. The height of fall of cup of the liquid limit device is adjusted to be 1 cm. Some quantity of the paste is taken into the cup and leveled by spatula. Then a groove is cut in the soil paste using standard grooving tool.
The cup is given blows by the handle either manually operated or electrically operated motorized system. The rotation of the handle being in 2 revolution per second. The number of blows to close the groove for a distance of 13 mm is noted down. Some quantity of the soil at the place where the grove has closed is taken for water content determination. The above steps are repeated to get at least A concurrent sets for number of blows and water content.
The water content values are plotted as ordinate on natural scale against number of blows as abscissa on logarithmic scale to obtain a best fitting straight line which is the flow curve. From this graph we can obtain the liquid limit corresponding to 25 blows.
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