Cone Penetrometer

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. It will consist of metallic cone with half angle of 15' -30 ±15' and 30.50mm coned length. It will be fixed at the end of a metallic rod with a disc at the top of the rod so as to have a total sliding weight of 148± 0.5 gms. The total rod shall pass through two guides. (to ensure vertical movement) fixed to a stand. Suitable provision will be made for clamping the vertical rod at any desired height above the surface of the paste in the trough. A brass trough 50 mm internal diameter and 50 mm depth will be provided as per IS specification resting on M.S.bars.