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