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Plasticity index (ip)

This represents the humidity interval on passing from the semi-solid to the semi-liquid state (IP = WL ? WP). Given the liquid limit (WL) and the plastic limit (WP), a representative point of each soil sample on the Casagrande plasticity chart can be obtained. This will represent the relationship of the liquid limit (WL), with the plasticity limit IP (IP = WL ? WP).