What is liquid limit, plastic limit

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Accepted Answer

Liquid limit and plastic limit are soil properties used to determine the behavior of soil under different moisture conditions.

Liquid limit is the moisture content at which a soil transitions from a liquid to a plastic state.
Plastic limit is the moisture content at which a soil transitions from a plastic to a semi-solid state.
These limits are determined through laboratory tests using specific apparatus and procedures.
The liquid limit is measured using a Casagrande cup and a standard number of blows to close a groove of soil.
The plastic limit is determined by rolling a soil sample into a thread until it crumbles.
The difference between the liquid limit and plastic limit is known as the plasticity index.
The plasticity index provides an indication of the soil's ability to change its shape and retain water.
Soils with high plasticity index are more likely to experience volume changes and are classified as clayey soils.
Understanding the liquid limit and plastic limit helps in soil classification, engineering design, and construction.

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