Which field manual test is used to differentiate between cohesive material with fissures, unfissured cohesive material, and granular material?

The drying test is specifically designed to assess the moisture content and physical changes of soil samples when subjected to drying conditions. This test can provide information that helps differentiate between various types of soil based on their moisture characteristics and behavior.

However, when it comes to distinguishing between cohesive materials (those that stick together, such as clay), as well as differentiating between fissured and unfissured cohesive materials, the plasticity test is more suitable. The plasticity test evaluates the plasticity index of the soil, which indicates its plastic and non-plastic behavior under varying moisture contents. This aspect is crucial for identifying cohesive soils, which react differently to moisture compared to granular soils (like sand).

The pat test and moisture content test serve important roles in soil analysis as well, but they don't specifically address the differentiation of cohesive materials as effectively as the plasticity test does. The pat test evaluates the workability and characteristics of soil in its wet state, while the moisture content test quantifies the amount of water in the soil without directly providing insight into its cohesive properties.

In conclusion, the plasticity test is the appropriate test for identifying and differentiating between cohesive and granular materials, especially with regard to their fissuring characteristics.