Clays generally have low strength, high compressibility and high volumetric changes. Because of clay's high plasticity, permeability, bearing capacity and settlement characteristics, it is a material that has been studied and is still being studied in geotechnical engineering.

What is the plasticity of clay?

Plasticity is the outstanding property of clay–water systems. It is the property a substance has when deformed continuously under a finite force. ... Mineralogical composition, particle size distribution, organic substances and additives can affect the plasticity of clays.

What does high plasticity clay mean?

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.