Which Atterberg limit is specifically related to a soil's capacity to hold water?

• A. Liquid Limit
• B. Shrinkage Limit
• C. Plastic Limit
• D. None of the above

Answer: (A)

The Liquid Limit is specifically related to a soil's capacity to hold water because it defines the moisture content at which soil changes from a plastic state to a liquid state. This limit is a key indicator of the soil's water-holding capacity and its behavior when saturated. When the moisture content is at the Liquid Limit, the soil can flow and will behave like a liquid under applied stress.

This limit is determined through standard testing procedures, such as the Casagrande method, where a sample of soil is subjected to a specific mechanical test to determine the moisture content at which it transitions from a semi-solid to a fully plastic state. Thus, knowing the Liquid Limit helps engineers and soil scientists assess how susceptible a particular soil is to water-induced changes, such as those affecting stability and strength.

The other limits, while important, do not specifically focus on the soil's water-holding capacity in the same way. For example, the Plastic Limit defines the moisture content at which soil transitions from a plastic state to a semi-solid state, while the Shrinkage Limit indicates the moisture content below which soil no longer undergoes volume changes upon drying. These limits are important for understanding soil behavior, but when it comes to the specific capacity to hold water, the Liquid Limit