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The plasticity index (PI) is a measure of the plasticity of soil. The plasticity index is the size of the range of water contents where the soil exhibits plastic properties. The PI is the difference between the liquid and plastic limits (PI = LL-PL). Soils with a high PI tend to be clay, those with a lower PI tend to be silt, and those with a ...
Plasticity index: 6 max N.P. 10 max 10 max 11 min 11 min 10 max 10 max 11 min 11 min 1: Usual types of significant constituent materials stone fragments, gravel and sand fine sand silty or clayey gravel and sand silty soils clayey soils General rating as a subgrade excellent to good fair to poor
Lean clay PI < 4 and plots below "A" line ML Silt Organic Liquid limit—oven dried < 0.75 OL Organic clay Liquid limit—not dried OL Organic silt Silts and Clays. Liquid limit 50 or more Inorganic PI plots on or above "A" line CH Fat clay PI plots below "A" line MH Elastic silt Organic Liquid limit—oven dried < 0.75 OH Organic clay
Clay has a high content of clay minerals that give it its plasticity. Clay minerals are hydrous aluminium phyllosilicate minerals, composed of aluminium and silicon ions bonded into tiny, thin plates by interconnecting oxygen and hydroxide ions. These plates are tough but flexible, and in moist clay, they adhere to each other.
In those conditions the consistency quality depends upon the clay content. In the wet state, the two qualities of stickiness and plasticity are assessed. A soil's resistance to fragmentation and crumbling is assessed in the dry state by rubbing the sample. Its resistance to shearing forces is assessed in the moist state by thumb and finger ...
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The Plasticity Index of a particular soil specimen is defined as the difference between the Liquid Limit and the Plastic Limit of the specimen; it is an indicator of how much water the soil particles in the specimen can absorb, and correlates with many engineering properties like permeability, compressibility, shear strength and others ...
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