Liquid Limit Device with Counter

IS 2720 (PART V), BS 1377-2, ASTM4318Specification: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 soil is useful to concrete mechanical properties of soil, such as compressibility and lower shear strengh. liquid limit is the water content at which soil passes from zero strength to an infinite strength, hence the value of liquid 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 11.25cm under an impact of 25 blows in a standard liquid limit apparatus. the soil at the water content has some strength which is about 0.17 N/cm.sq (17gms/sq.cm) At this water content soil just passes fromliquid state to plastic state.