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Plastic Limit is determined by repeatedly remolding a small ball of moist plastic soil and manually rolling it out into a 1/8in thread. A plastic limit roller device can also be used to perform this test. The Plastic Limit is the moisture content at which the thread crumbles before being completely rolled out.

2.1 Plasticity Index. The PI is defined as the range of moisture contents over which the soil deforms plastically. The PI is thus defined to be the difference between the LL and the PL; i.e., (2.19) PI = LL − PL. The PI thus is a measure of the plasticity of a soil.

Index testing, also referred to as partner testing/partner notification services, is an approach whereby the exposed contacts (i.e., sexual partners, biological children and anyone with whom a needle was shared) of an HIV-positive person (i.e., index client), are elicited and offered HIV testing services.

Take about 8 gm of this plastic soil mass and roll it between fingers and glass plate with just sufficient pressure to roll the mass into a thread of uniform diameter throughout its length. The rate of rolling shall be between 80 and 90 strokes per minute. Continue rolling till you get a thread of 3 mm diameter.

Calculate the plasticity index of a soil as the difference between its liquid limit and its plastic limit, as follows: PI = LL − PL Report PI as non-plastic (NP) when: 1. The liquid limit or the plastic limit cannot be determined, or 2. The plastic limit is equal to or greater than the liquid limit.

The plasticity index is expressed in percent of the dry weight of the soil sample. It shows the size of the range of the moisture contents at which the soil remains plastic. In general, the plasticity index depends only on the amount of clay present.