Plate Load Test for Soil: Procedure, Results, and Scale Effects

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A plate load test applies controlled load to a rigid plate resting on soil or an unbound pavement layer and measures the resulting deflection or settlement. The load-settlement curve can support evaluation of subgrade reaction, deformation response, or bearing behavior, but the meaning depends on the test standard and application. In current U.S. practice, pavement … Read more

Atterberg Limits Explained: LL, PL, PI, and Soil Classification

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Atterberg limits are water-content boundaries used to describe the consistency of fine-grained soil. The liquid limit (LL) separates plastic and liquid behavior, the plastic limit (PL) separates semisolid and plastic behavior, and the shrinkage limit (SL) marks the point below which further drying produces little additional volume reduction. The plasticity index is PI = LL … Read more