Soils for engineering use are often
classified based on properties relative to foundation support or as they might
perform under pavements and in earthworks. Geotechnical classification systems
today are designed to make it easy to equate field observations to estimates of
engineering properties. As moisture content of a clay-like soil increases, it
goes through four distinct states of consistency: solid, semi-solid, plastic,
and liquid. Each stage is defined by significant changes in s...