Which test helps in classifying soil by determining its plasticity?

The wet ball test is utilized to classify soil based on its plasticity, which refers to the soil's ability to deform without breaking when subjected to stress or pressure. This test involves preparing a soil sample that is saturated with water and then forming it into a ball. The consistency of the ball, as it is manipulated, provides insight into the soil's plasticity properties. If the ball can hold its shape under pressure or deformation, it indicates higher plasticity. Conversely, failing to maintain shape signifies lower plasticity.

Understanding soil plasticity is crucial in construction and geotechnical engineering, as it guides decisions on suitable applications and methods for soil stabilization, grading, and foundation design. The wet ball test is an established method to obtain reliable data on this property, facilitating effective soil classification for engineering purposes.