![]() If plasiticity index ranges between 4–7%, soil is represented in dual symbol. The soil fall above A-line in plasticity chart are clayey soils and that fall below A-line are silt and organic soils. 005 Colloid < 0.002 Particle diameter (mm) Bulky Particles Plate/Needle Particles. OI: organic soil with intermediate plasticity ![]() The plasticity characteristic of fine grained soil based on different liquid limit range is shown below. These limits were created by Albert Atterberg, a Swedish chemist and agronomist, in 1911. In most of the cases, dry strength of clay is greater than that of silts. Surface texture of silt is smooth and slippery to touch when wet, while clay is sticky and plastic-like when wet. Plasticity of clay is much more than that of silt. The water content at which soil changes from one state to the other is known as consistency limits, or Atterbergs limit. Clay contains clay minerals,while silts do not contain clay minerals. ![]() The equation of A-line gives value of plasticity index ranges from 0 to 58.4 corresponding to values of liquid limit from 0 to 100%. The Atterberg limits can be used to distinguish between silt and clay and to distinguish between different types of silts and clays. If more than 50% percent of soil passes through 75micron sieve, then it is classified as fine-grained soil.Įquation of A-line as represented in the given chart relates plasticity index and liquid limit as Plasticity chart is a graph between plasticity index (IP) and liquid limit (WL) in percentage which is used for classification of fine-grained soils as per the Indian Standard Soil Classification System(ISSCS). ![]()
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