What symbol is used for low plasticity silt?

The symbol used for low plasticity silt is ML. In soil classification, the Unified Soil Classification System (USCS) categorizes soil types based on their grain size and plasticity characteristics.

Low plasticity silt falls under the category characterized by the symbol ML. This classification indicates that the soil has a fine-grained texture and exhibits low plasticity, meaning it has limited ability to deform without cracking or breaking. Low plasticity silt is distinguished by its ability to retain moisture but not to the extent of being overly plastic or sticky, which is typical of other classifications, such as clays.

Understanding this classification is crucial for civil engineering and construction applications, where soil behavior under varying moisture conditions must be anticipated. The use of ML for low plasticity silt allows professionals to convey important information on soil behavior, which aids in making informed decisions regarding soil management and construction practices.