For determining penetration resistance (N Value) of soil which can be related to unconfined Compressive strength, Penetration resistance (N Value) of soil is determined by giving a number of blows with a 65 kg.
The sampler is made from a steel tube split lengthwise and held together by a head fitted with a ball check valve and a hardened steel shoe of inside cutting edge of 35 mm dia. The sampler is 35 mm I.D. and 50.8 mm in outer diameter and 508 mm long.
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