In soil testing, Atterberg limit tests relate to which property of soils?

• A. Water content at the different states of consistency
• B. Shear strength at failure
• C. Grain-size distribution
• D. Dry density

Answer: (A)

Atterberg limits focus on how a soil’s consistency changes with water content. They define the water contents at which soil changes state—from plastic to liquid (liquid limit) and from semi-solid to plastic (plastic limit)—with the difference between these two values giving the plasticity index. This concept is all about moisture levels and the resulting state of the soil, especially for clays where moisture has a big effect on strength and deformability.

So, the property being described is the water content at different states of consistency. These limits don’t directly measure shear strength, grain-size distribution, or dry density, which are obtained from other tests.