Liquid Limit Device With Counter
IS 2720 (PART V), BS 1377-2 , ASTM D 4318
Specification:
Casagrande method in mechanical form is known as liquid limit method and has been in use for soil mechanics for a number of
decades. 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
infinite 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 1.25cm under
an impact of 25 blows in a standard liquid limit apparatus. The soil at the water
content has some strength which is about 0.17N/cm. sq. (17gms/sq.cm.) . At this
water content soil just passes from liquid state to plastic state.
It consists on a brass cup held on an adjustable bracket.
The cup can be adjusted for a fall of 1 cm and can be raised an dropped on a
rubber base of standard hardness by cam action. Complete with one Casagrande
grooving tool, one ASTM grooving tool and a height gauge block. A counter to
register the number of blows.