What classification is used for inorganic clayey silts, also known as elastic silts?

The classification used for inorganic clayey silts, often referred to as elastic silts, is indicated by the symbol "MH." In the Unified Soil Classification System (USCS), "MH" stands for "Inorganic silts that are elastic," which describes their specific properties, such as being silty with some plasticity that allows them to deform without breaking. These materials tend to have characteristics that are distinguishable from both clays and other silts, making them unique in their behaviors under load.

The classification is important because it helps engineers and geologists predict how this type of soil will behave in various conditions, particularly in terms of strength, compressibility, and seepage characteristics. Identifying these soils accurately can inform construction, foundation design, and other geotechnical considerations, ensuring proper engineering practices are followed. Understanding this classification aids in assessing the mechanical properties and necessary treatment for these materials in construction and civil engineering projects.