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The minimum water content at Which soil mass still flows like a liquid is called
liquid limit
plastic limit
Shrinkage limit
flow limit
liquid limit
The liquid limit (often denoted as wLтАЛ) is the minimum water content at which a soil passes from the plastic state to the liquid state. In this state, the soil exhibits a very small shearing strength against flowing, which is standardized by the Casagrande apparatus.
The liquid limit (often denoted as wLтАЛ) is the minimum water content at which a soil passes from the plastic state to the liquid state. In this state, the soil exhibits a very small shearing strength against flowing, which is standardized by the Casagrande apparatus.
N=25 тАФ The standard number of blows in Casagrande's test to define the liquid limit.
IPтАЛ=wLтАЛтИТwPтАЛ тАФ Plasticity index calculation using liquid and plastic limits.
As water content increases in a fine-grained soil, the repulsive forces between clay particles increase due to the thickening of the diffuse double layer. At the liquid limit, these forces overcome the cohesive forces sufficiently such that the soil behaves as a viscous fluid. This state is defined by the requirement that a groove made in the soil sample closes over a distance of 12.7 mm after 25 standard blows.
The liquid limit is one of the fundamental Atterberg limits.
It is primarily used to classify fine-grained soils in the Unified Soil Classification System (USCS).
Soil at the liquid limit has a nominal undrained shear strength of approximately 2.7 kPa (0.27 N/cm┬▓).
Provides a reproducible index for soil consistency.
Essential for calculating the Liquidity Index and Plasticity Index.
Test results can be operator-dependent.
Requires careful preparation of soil passing through a 425-micron sieve.
Determining the compressibility of clayey soils.
Assessing soil suitability for construction (e.g., road subgrades, foundations).
Option B (Plastic limit) is the water content where soil transitions from semi-solid to plastic state.
Option C (Shrinkage limit) is the water content below which no further volume change occurs upon drying.
Option D (Flow limit) is a redundant term often confused with liquid limit in some contexts.
A is correct тАФ The liquid limit is the specific moisture content threshold where soil changes behavior from plastic to liquid.
Always remember that Atterberg limits are defined only for the fine-grained fraction (passing 425 ╬╝m sieve) of the soil.