Discussion
The plastic and liquid limits of a clay are determined by
Answer: D
Correct answer: simple bench tests on the wetted material
The Atterberg limits are determined by hand: the liquid limit with a Casagrande cup or a fall cone, and the plastic limit by rolling a thread until it crumbles at three millimetres. They are moisture contents at which the behaviour changes, so they can only be found by wetting the clay and observing it, and no instrumental analysis substitutes for them.
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