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Consistency of soil is used to describe firmness of .......... soils related to water content.
Coarse grained soil
Fine grained soil
Coarse sand
Fine sand
Fine grained soil
Consistency is a physical property of fine-grained soils (clays and silts) that denotes their degree of firmness, representing their relative resistance to deformation at different moisture levels. It is defined by Atterberg limits, which demarcate the transition between liquid, plastic, and solid states.
Consistency is a physical property of fine-grained soils (clays and silts) that denotes their degree of firmness, representing their relative resistance to deformation at different moisture levels. It is defined by Atterberg limits, which demarcate the transition between liquid, plastic, and solid states.
IPтАЛ=wLтАЛтИТwPтАЛ тАФ Plasticity Index (Range of water content where soil remains plastic)
ICтАЛ=IPтАЛwLтАЛтИТwnтАЛтАЛ тАФ Consistency Index (Relative position of natural water content wnтАЛ)
In fine-grained soils, the presence of clay minerals allows for the adsorption of water layers around particles. As water content increases, the thickness of these films increases, reducing the inter-particle cohesive forces and changing the soil's consistency from solid to semi-solid, then plastic, and finally liquid.
Consistency is strictly defined for cohesive soils (fine-grained).
Coarse-grained soils possess no plasticity and thus do not exhibit 'consistency' in this context.
The transition points are identified as Liquid Limit (wLтАЛ), Plastic Limit (wPтАЛ), and Shrinkage Limit (wSтАЛ).
Provides a basis for soil classification (e.g., Plasticity Chart).
Helps in predicting engineering behavior like compressibility and shear strength.
Tests like Casagrande's method are operator-dependent.
Does not account for the structural arrangement or fabric of the soil.
Road pavement design (Subgrade evaluation).
Foundation settlement prediction.
Excavation feasibility and soil stabilization.
Consistency is not applicable to Coarse Grained soils (Sand/Gravel) as they are cohesionless.
Coarse-grained soils are characterized by Relative Density (DrтАЛ) rather than consistency limits.
B is correct тАФ Consistency is an index property specifically used to quantify the behavioral states of fine-grained cohesive soils based on moisture content.
Always remember: Plasticity Index is the bridge between soil moisture and consistency; if a soil has zero plasticity, it is coarse-grained and does not have consistency limits.
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