Liquid Limit Device
Standard : IS 2720 (PART V), BS 1377-2, ASTM D 4318
Model No. : PIT-006
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. The Equipment 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 Casagrande method 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 Casagrande 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, a height gauge block. A counter to register the number of blows
Primetek Liquid Limit Device comes with 1 year of standard warranty