5-10 Low plasticity 1-5 Slightly plastic 0 Nonplastic >40 Very high plasticity 20-40 High plasticity 10-20 Medium plasticity PI Description. A plastic clay body can withstand the addition of considerable amounts of water, passing through a stage in which it remains dry to the fingers and is easily molded. The equation of the A-line is. Soils with a high PI tend to be clays, those with a lower PI tend to be silts and those with a PI of 0 (non-plastic) tend towards sands with little or no clay or silt. plastic limit, and plasticity index geotechnical test method gtm-7 revision #2 august 2015. eb 15-025 page 1 of 16 geotechnical test method: test method for liquid limit, plastic limit, and plasticity index gtm-7 revision #2 state of new york department of transportation The plasticity characteristic of fine grained soil based on different liquid limit range is shown below. The vertical line at LL = 50 separates high-plasticity soils from low-plasticity soils. The A-line separates clay from silt. 7 Activity (A) (percent clay-size fraction by weight) PI A= ()percentclay size fractionby weight PI A − = 8 Plasticity Index and Clay Content Soils with a high PI tend to be clay, those with a lower PI tend to be silt, and those with … From the plasticity chart, CL: Clay with low plasticity. Plasticity index shows the size of the range of the moisture content at which the soil remains plastic. "The Plasticity Index is simply the numerical difference between the liquid limit and the plastic limit for a particular material and indicates the magnitude of the range of moisture content over which the soil remains plastic. A high value of PI indicates an excess of clay in the soil and that results in greater plasticity of that soil. Usually plasticity index depends on the amount of clay present in the soil. The soil 14 have a plastic index lower than 7, it is the only slightly plastic soil above the sixteen. It is a measure of the cohesive … Also, the corresponding plasticity index of these soils is in the range 6.15 to 26.85, with an average value of 16.1. Plasticity of Soils Page | 33 4.4 PLASTICITY, LIQUIDITY, AND CONSISTENCY INDEXES Plasticity index: Plasticity index (PI) is the range of water content over which the soil remains in the plastic state and mathematically defined as, The plasticity index is the size of the range of water contents where the soil exhibits plastic properties. States of consistency and plasticity limits of clays (adapted from Reed, 1995), PL = plastic limit, LL = liquid limit, PI = plasticity index. The PI is the difference between the liquid limit and the plastic limit (PI = LL-PL). The PI is the difference between the Liquid Limit and the Plastic Limit (PI = LL – PL). I P = W L-W P . 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%. Plasticity index of a soil depends upon its fineness: finer the soil, more is its plasticity index. The Plasticity Index (PI) is a measure of the plasticity of a soil. https://www.geoengineer.org/education/laboratory-testing/atterberg-limits The correlation between plasticity index and liquid limit as proposed by Nagraj and Jayadeva, 1983 is given below: ML: Silt with low plasticity. Plasticity index is the indicative of the range of water contents over which the soil remains in plastic state. The liquid limit and plasticity index in the Unified Soil Classification System are determined and plotted on the plasticity chart.
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