What is the purpose of the Atterberg Limits test?

The Atterberg Limits test is a critical method used in geotechnical engineering to evaluate the plasticity and behavior of fine-grained soils, particularly in varying moisture conditions. It focuses on determining two primary moisture points: the liquid limit and the plastic limit.

The liquid limit is the moisture content at which the soil changes from a plastic state to a liquid state, while the plastic limit is the moisture content at which the soil changes from a semi-solid state to a plastic state. By identifying these limits, the test provides valuable insights into how a soil will behave when it is wet or dry, which is essential for understanding its suitability for construction and how it will interact with other materials, especially under load or when subjected to environmental changes.

This understanding is crucial for applications involving earthworks, foundations, and pavement design, where fine aggregates may behave differently based on their moisture content. Hence, the correct identification of their plasticity and behavioral characteristics directly impacts material selection and project success.