atterberg limits of soil l.
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Atterberg Limits of Soil. Prepared by: Marcia C. Belcher Construction Engineering Technology University of Akron. Atterberg . Albert Atterberg was a Swedish chemist and agricultural scientist. Conducted studies to identify the specific minerals that give a clayey soil its plastic nature

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atterberg limits of soil

Atterberg Limits of Soil

Prepared by:

Marcia C. Belcher

Construction Engineering Technology

University of Akron

atterberg
Atterberg
  • Albert Atterberg was a Swedish chemist and agricultural scientist.
  • Conducted studies to identify the specific minerals that give a clayey soil its plastic nature
  • Stated that depending on the water content, soil may appear in four states:
      • Solid (no water)
      • semi-solid (brittle, some water)
      • plastic (moldable)
      • liquid (fluid)
  • In each state the consistency and behavior of a soil is different and thus so are its engineering properties.
  • The boundary between each state can be defined based on a change in the soil's behavior.
atterberg limits
Atterberg Limits

(Non-Plastic )

Plasticity Index

Solid

Brittle

Plastic

Liquid

Water Content

w%=0

wll

Wpl

Plastic Limit Liquid Limit

plastic limit
Plastic limit
  • The plastic limit (PL) is the water content (w%) where soil starts to exhibit plastic behavior.
liquid limit
Liquid limit
  • The liquid limit (LL) is the water content where a soil changes from liquid to plastic behavior
  • Determined using a Casagrande cup (lab) or cone penetrometer (field)
shrinkage limit
Shrinkage limit
  • The shrinkage limit (SL) is the water content where further loss of moisture will not result in any more volume reduction
  • The shrinkage limit is much less commonly used than the liquid limit and the plastic limit.
use of plasticity index
Use of Plasticity Index
  • The PI is the difference between the liquid limit and the plastic limit (PI = LL-PL).
  • The plasticity index is the size of the range of water contents where the soil exhibits plastic properties.
  • Meaning:
    • High PI tend to be clay
    • Low PI tend to be silt
    • PI of 0 tend to have little or no silt or clay.
use of liquid plastic limits
Use of Liquid & Plastic Limits
  • Used internationally for soil identification and soil classification (AASHTO)