Which symbol is used to denote clayey sand in soil classification?

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The symbol used to denote clayey sand in soil classification is "SC." In the Unified Soil Classification System (USCS), each symbol represents a different soil type based on its grain size and plasticity characteristics.

Clayey sand is classified as a mixture that has a significant amount of sand with clay content, and the "C" stands for clay. The "S" in the symbol indicates that sand is the predominant fraction. Hence, "SC" signifies a soil that is primarily sandy but also has enough clay to impart significant plasticity, making it behave differently than purely sandy soils.

This classification is important for engineering purposes as it influences the soil's behavior under loading conditions, its drainage characteristics, and its suitability for construction. Understanding these classifications helps soil engineers and geotechnical professionals make informed decisions about soil management and construction practices.