![]() ![]() Today, his methods determine the liquid limit, plastic limit, and shrinkage limit of soils. In the early 1930s, engineers Karl Terzhagi and Arthur Casagrande recognized the value of characterizing soil plasticity for use in geotechnical engineering applications.Ĭasagrande helped to refine and standardize the tests. ![]() He found that plasticity is a unique property of cohesive soils such as clay and silt.Īs a result, Atterberg suggested classifying these soils with a particle size of 2µm (0.002mm) or less as clays to differentiate them from silt. In 1911, Swedish chemist and agricultural scientist Albert Atterberg discovered a way to distinguish between different types of finely-grained soil using the Atterberg Limits Test.
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