In general, the plasticity index depends only on the amount of clay present. It indicates the fineness of the soil and its capacity to change shape without altering its volume. A high PI indicates an excess of clay or colloids in the soil. … The greater the PI, the greater the soil compressibility.
Which soil has more plasticity index?
Soils with a high PI tend to be clay, Those with a lower PI tend to be silt, and.
What properties does clay have?
There are three essential properties that make clay different from dirt. These are plasticity, porosity, and the ability to vitrify.