DETERMINATION OF PLASTIC LIMIT USING MATHEMATICAL MODEL

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Using a mathematical model which predicts the moisture-penetration relationship up to zero moisture content, a model which computes the plastic limit based on the penetration value at the plastic limit is proposed. The model was developed using 194 Atterberg limit test results and validated using 44 soil data collected from the literature. Calculated and determined plastic limits agreed within the narrow range of PL±3, with 92% of the results within the accuracy of PL±1. The calculated plastic limit using the proposed model was found to be within the statistical testing bound of PL±PL*18% provided in AASHTO T90-94.

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