Atterberg Limits are used primarily for classifying which type of soil?

• A. Sandy soil
• B. Clay soil
• C. Gravelly soil
• D. Organic soil

Answer: (B)

Atterberg Limits are essential in geotechnical engineering for characterizing the behavior and plasticity of fine-grained soils, particularly clay soils. The Atterberg Limits include the Liquid Limit, Plastic Limit, and Shrinkage Limit, which provide critical information about the water content at which soil transitions between different states: solid, plastic, and liquid.

Clay soils are particularly interesting because they exhibit significant changes in behavior with varying moisture content. Their small particle size and shape allow them to absorb water and change from a plastic state to a liquid state, which is what the Atterberg Limits measure. This capability is less prominent in sandy soils, gravelly soils, or organic soils, which do not typically undergo the same significant changes in plasticity and consistency with moisture variations.

In summary, while other soil types are important in different contexts, the Atterberg Limits are specifically tailored to understanding and classifying the properties of clay soils, making this the most appropriate choice.