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The K-value test (also called Plate Bearing Test) is an in-situ field test used to determine the modulus of subgrade reaction (k-value) of soil. It represents the stiffness of soil under a loaded plate and is mainly used in pavement design. Basic Concept Load is applied on a rigid circular plate Corresponding settlement is measured Ratio of pressure to settlement gives k-value It indicates how much soil resists deformation Purpose of K-Value Test For Soil: Determine subgrade stiffness Evaluate support for pavements Study load–deflection behavior Design flexible and rigid pavements For Pavement Design: Used in rigid pavement (cement concrete roads) Input for Westergaard analysis Helps in thickness design of slabs
