Write the laboratory procedure to determine liquid limit by Casagrande’s method with neat sketch.

Write the laboratory procedure to determine liquid limit by Casagrande’s method with neat sketch.
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1 Answer

Answer :

Procedure of liquid limit

1. Take about 120 gm of air dried soil sample passing through 425 micron IS

Sieve in metal tray.

2. Add 20% distilled water to form uniform soil paste.

3. Put this soil paste in the brass cup of Casagrande’s apparatus and spread horizontally into portion with few strokes of spatula.

4. Trim the soil upto a depth of 1 cm maximum thickness and remove excess soil if any.

5. divide the soil sample in two parts by the firm strokes of the grooving tool along the diameter through the centre of brass cup so that clean sharp groove of proper dimension is formed.

6. Rotate the handle of casagrande’s apparatus at a rate of 2 revolutions per second until two parts of the soil will come in contact with each other for a length of 12mm by flow only.

7. Count the number of blows required to close the groove for about 12mm. it is recorded as N.

8. Take representative portion of soil for water content determination as w%.

9. Repeat all above steps by changing water in soil sample to get number of blows between 10 to 50. Record the number of blows and corresponding water content for various trials.

10. Draw the flow curve i.e. Number of blows required as abscissa ( log scale) versus water content determined as ordinate (natural scale) on semi logarithmic graph paper.

11. Find out the water content corresponding to 25 blows from the graph as liquid limit (wL) of given soil sample. 

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(ii) Grooving Toos
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