Which symbol represents high plasticity clay?

High plasticity clay is represented by the symbol CH in the Unified Soil Classification System (USCS). This classification is focused on the plasticity characteristics of clay soils, indicating their ability to deform under stress without breaking.

The CH classification specifically denotes clays that exhibit high plasticity, meaning they can undergo significant changes in shape and volume when moisture is added or removed. This property is important for understanding how the soil will behave in various engineering and environmental conditions, affecting construction, stability, and drainage.

The other symbols represent different types of soils or plasticity levels. For instance, CL stands for low plasticity clay, while ML and MH refer to silty soils with low and high plasticity, respectively. Each classification has distinct characteristics that inform engineers and geotechnical professionals about how to approach soil-related projects effectively. Thus, the recognition of CH as high plasticity clay is crucial for appropriate engineering assessments and practices.