LIQUID LIMIT DEVICE





Description:

 

LIQUID LIMIT DEVICE:

AS PER IS: 2720 (Part V), 9259, BS: 1377, AS: 89.

 

Introduction:

  • Casagrande method in mechanical form is known as Liquid Limit Method and has been in use for soil mechanics for a number of years.
  • The Liquid Limit data of soils is useful to correlate mechanical properties of soil, such as compressibility and lower shear strength.
  • Liquid limit is the water content at which soil passes from zero strength to an infinitesimal strength, hence the true value of liquid limit cannot be determined.
  • For determination purpose liquid limit is that water content at which a part of soil, cut by a groove of standard dimensions, will flow together for a distance of 1.25 cm under an impact of 25 blows in a standard liquid limit apparatus.
  • The soil at the water content has some strength which is about 0.17 N/cm. sq. (17gms/sq.cm.)
  • At this water content soil just passes from liquid state to plastic state.

 

General Description and Specifications:

 

1) LIQUID LIMIT DEVICE (HAND OPERATED):

It consists of a brass cup held on an adjustable bracket. The cup can be adjusted for a fall of 1 cm and can be raised and dropped on a rubber base of standard hardness by cam action. Complete with one Casagrande grooving tool, one ASTM Grooving tool and a high gauge block (Type A of IS 9259).

 

 

2) LIQUID LIMIT DEVICE (WITH COUNTER):

It consists of a brass cup held on an adjustable bracket. The cup can be adjusted for a fall of 1 cm and can be raised and dropped on a rubber base of standard hardness by cam action. Complete with one Casagrande grooving tool, one ASTM Grooving tool and a high gauge block (Type A of IS 9259) Fitted with a counter to register the number of blows.

 

3) LIQUID LIMIT DEVICE (MOTORISED):

It consists of a brass cup held on an adjustable bracket. The cup can be adjusted for a fall of 1 cm and can be raised and dropped on a rubber base of standard hardness by cam action. Complete with one Casagrande grooving tool, one ASTM Grooving tool and a high gauge block (Type A of IS 9259) with a counter & fitted with a motor geared down to give approximately 120 r.p.m. Suitable for operation on 230 Volts, single phase, 50 cycles, A.C. supply.

 

Spares: Casagrande grooving tool. ASTM Grooving tool, Height block, 1 cm high.

 

 

 

 

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