For more details on soil plasticity, please look at web site given by Mr. Jerry Carlson in an answer to this question. Plasticity is exhibited by a soil due to the clay minerals present in it. Criteria: i. Steep slopes of clay in areas of heavy rainfall may be have to be held in place by ground cover to prevent landslides. Both liquid and plastic limits depend upon the amount and type of clay present in soil (IS-2720-Part 5-1995). The topics of interest include plastic behaviour of single crystals and polycrystalline metals, ceramics, rocks and soils, composites, nanocrystalline and microelectronics materials, shape memory alloys, ferroelectric ceramics, thin films and polymers, as well as plasticity aspects of failure and fracture mechanics. Plasticity of Soil It is the property of soil by which it undergoes deformation without cracking or fracturing.

This parameter cannot be negative if plastic limit, in some exceptions, is larger than liquid limit, ignoring negative value, it is considered zero. Lay persons can get a rough measure of soil plasticity … 4.1 PLASTICITY CHARACTERISTICS OF SOILS The plasticity of a soil is its ability to undergo deformation without cracking. Usually plasticity index depends on the amount of clay present in the soil. A high value of PI indicates an excess of clay in the soil and that results in greater plasticity of that soil. Motivation and historical perspectives Thermodynamical foundations Conventional elastoplastic models for soils Advanced topics: anisotropic hardening plasticity Evidence of nonlinear and irreversible behavior Granular materials exhibitvery complex responsesunder applied loads, even under … With reference to practical engineering problems it is shown that considerable differences may be encountered between the results from associated and those from non-associated plasticity theories. Both liquid and plastic limits depend upon the amount and type of clay present in soil (IS-2720-Part 5-1995). The plasticity index, in combination with water content at liquid limit (wL), indicates how sensitive the soil is to the changes in moisture content. Since clay contains a considerable percentage of scale-like particles, they are plastic; whereas, coarser, materials with round grains such as sandy soils and most silts have characteristically low P.I. This parameter cannot be negative if plastic limit, in some exceptions, is larger than liquid limit, ignoring negative value, it is considered zero. The soil should be clay. Plasticity Index. The range of consistency within which a soil exhibits plastic properties is called plastic range and is indicated by plasticity index.

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