Determination of Liquid Limit and Plastic Limit of Soil

Determination of Liquid Limit and Plastic Limit of Soil


Apparatus

  1. Liquid Limit Device ‑ a mechanical device consisting of a brass cup suspended from a carriage designed to control its drop onto a hard rubber base. The device may be operated by either a hand crank or electric motor.
  2. Cup ‑ brass with mass (including cup hanger) of 185 to 215 g.
  3. Cam ‑ designed to raise the cup smoothly and continuously to its maximum height, over a distance of at least 180o of cam rotation, without developing an upward or downward velocity of the cup when the cam follower leaves the cam.
  4. Flat Grooving Tool ‑ a tool made of plastic or non‑corroding metal having specified dimensions.
  5. Gage ‑ A metal gage block for adjusting the height of the drop of the cup to 10 mm.
  6. Ground Glass Plate ‑ used for rolling plastic limit threads.

Significance and Use

This testing method is used as an integral part of several engineering classifications systems to characterize the fine‑grained fractions of soils and to specify the fine‑grained fraction of construction materials. The liquid limit, plastic limit and plasticity index of soils are also used extensively, either individually or together, with other soil properties to correlate with engineering behavior such as compressibility, permeability, compactibility, shrink‑swell and shear strength.

Scope

This test method covers the determination of the liquid limit, plastic limit and plasticity index of soils. The liquid and plastic limits of soils are often referred the as the Atterberg limits.
  • Workability of Concrete
  • Atterbergs Limits
  • Plastic limit of soil
  • Sieve Analysis
  • Civil Lab Tests
  • Liquid Limit
  • Liquid Limit in Sub grade
  • Plastic Limit Test

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