The specific soil water content separating the plastic condition from the liquid condition is designated as_________________?
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Answer: A. liquid limit
Explanation
The liquid limit establishes the critical moisture content threshold where fine-grained soils transition into a liquid state. At moisture levels above the liquid limit, the soil behaves like a viscous liquid with negligible shear strength. This boundary separating plastic and liquid behavior is a fundamental Atterberg limit used in soil classification. Atterberg limits were developed to quantify the water content boundaries of fine-grained cohesive clay and silt soils. The Casagrande cup test is the standard laboratory method used to determine the liquid limit of soil samples. Liquid limit values depend heavily on clay mineralogy, plasticity characteristics, and the presence of organic matter.
The plastic limit marks the moisture content boundary where soil transitions from a semi-solid to a plastic state. The shrinkage limit defines the maximum water content below which further moisture loss causes no volume reduction. The plasticity index is a numerical range representing the difference between liquid limit and plastic limit values.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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