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Architecture Engineering QUESTION #2354
Question 1
The Atterberg limit defining the minimum water content at which a soil behaves as a liquid (loses shear strength) and can be quantified by the Casagrande apparatus is:
  • Plastic Limit (PL)
  • Shrinkage Limit (SL)
  • Liquid Limit (LL)✔️
  • Flow Limit (FL)
Correct Answer Explanation
The Liquid Limit (LL) is the minimum water content at which a soil flows as a liquid under a small standardized shear force. It is determined using the Casagrande cup apparatus (25 blows to close a groove) or the cone penetrometer. The Plastic Limit (PL) is the minimum water content at which soil can be rolled into a 3 mm thread. The Plasticity Index PI = LL - PL.