The fall cone test has been recommended in many test standards for determining the liquid limit of fine-grained soils. A number of the existing fall cones and test methods are reviewed. A new approach of using the fall cone test to determine the plastic limit has recently been recommended. Key factors in using the fall cone test to determine both the liquid limit and the plastic limit are examined. It is concluded that the fall cone test with a fall cone of one weight is suitable for determining both the liquid limit and the plastic limit.
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