![]() ![]() ![]() The fallacy that strength at plastic limit is a constant is highlighted, and the implications for geotechnical practice are discussed. Critical state soil mechanics is used to show that the observed range of undrained shear strengths of soils at plastic limit is consistent with this hypothesis. This paper reviews the original definitions of plastic limit as proposed by Atterberg, and proposes that the brittle failure observed in the plastic limit test is caused by either air entry or cavitation in the clay. ![]() The thread-rolling test was standardised at the US Public Roads Bureau in the 1920s and 1930s, and has subsequently become one of the standard tests of soil mechanics. The fallacy that strength at plastic limit is a constant is highlighted, and the implications for geotechnical practice are discussed.ĪB - The plastic limit of soils was first described by Atterberg in 1911. Depending on its water content, soil may appear in one of four states: solid, semi-solid, plastic and liquid. This paper reviews the original definitions of plastic limit as proposed by Atterberg, and proposes that the brittle failure observed in the plastic limit test is caused by either air entry or cavitation in the clay. The Atterberg limits are a basic measure of the critical water contents of a fine-grained soil: its shrinkage limit, plastic limit, and liquid limit. N2 - The plastic limit of soils was first described by Atterberg in 1911. ![]()
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