Question

Why is it said that plasticity and cohesiocohesion an important role in workability of a soil?

Answer 1

Cohesion sticking or binding of soil together . nd plasticity helps the soil to attain any shapes that we require. if the cohesive property and plasticity increases it is easy to make any shapes with the soil.

Plasticity is a soil property which enables a moist soil to change shape
on an applied force and retain this shape even when the force is withdrawn. Thus sandy soils are
considered as non-plastic and clayey soils as plastic. Cohesion, on the other hand, is a property
of the particles to stick to one another by cohesive force. Plastic soils are cohesive. Plasticity and
cohesion reflect the soil consistency and workability of the soils. Black soils are highly plastic

and highly cohesive making tillage operation difficult.