Particle size classification of soil
In this system, soils are classified according to their grain size. Terms such as gravel, sand, silt, and clay are used to indicate grain sizes. The following systems are commonly used to classify soil according to their grain size.
- U.S Bureau of soil and Public Road Administration (PRA) System.
- International Soil Classification.
- MIT Classification.
- IS Classification.
The IS classification system (IS: 1498-1970) first developed in 1959 and revised in 1970. This system has been derived from the unified soil classification system. In this system soils are classified as follows:
The MIT classification system was proposed by Pro. Gilboy of U.S.A. In this system soil are classified as follows: