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Soil Testing Equipments

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Index Properties of Soil
Soil Cone Penetrometer
IS 2720 (PART IV)
For determining the liquid limit of soils. This is specially useful to obtain reliable and accurate results of those soil which have low plasticity index. The percentage moisture contents determined when cone with half angle of 15-30 minutes under a total sliding weight of 148 gm penetrates 25mm gives the liquid limit.
Semi Automatic Cone Penetrometer
BS 1377:2
Used to determine the moisture content at which clay soils pass from a plastic to a liquid state. Two Version are available. One the standard one & the other is semiautomatic with timer where the cone is allowed to free fall for a period of 5 seconds including one each of 50 gm. & 100 gm. weight, one penetration cone, preset counter & measuring cup.
Liquid Limit Device With Counter
IS 2720 (PART V), BS 1377-2 , ASTM D 4318
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.
Liquid Limit Device (Motorised)
Same as but fitted with a motor geared down to give approximately 120 rpm. Suitable for operation on 230 V A.C., Single Phase, 50 Cycles.

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