The Liquid Limit (LL) of a soil is the water content at which:
Choose the correct answer
Soil shrinks and cracks
Soil transitions from plastic to liquid state (groove in Casagrande cup closes in 25 blows)
Soil has maximum dry density
Soil reaches zero air voids
Correct Answer
B. Soil transitions from plastic to liquid state (groove in Casagrande cup closes in 25 blows)
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Liquid Limit (Casagrande): water content at which soil passes from plastic to liquid state. Measured when groove (cut by standard grooving tool in Casagrande cup) closes over 13 mm in 25 blows. At LL the soil has negligible shear strength ≈ 1.7 kPa. Higher LL → more compressible and less stable clay.
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