Casagrande method

A method for determining the liquid limit of a soil. A paste of soil and water is put in a shallow cup, the paste is cut into two parts with a deep groove and the cup is then dropped repeatedly in a standard manner until the groove has closed owing to the flow of the paste. At the liquid limit 25 repetitions are required.

This definition is abridged from A – Z of tree terms: A companion to British arboriculture.
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