What are the Liquid Limit (LL) and Plasticity Index (PI) values associated with a soil classified as CH?

A soil classified as CH refers to a type of clay that is high in plasticity, meaning it can undergo significant deformation before breaking. The Liquid Limit (LL) is a critical measure that determines the water content at which soil changes from a plastic to a liquid state. For CH clays, the LL values typically range above 50, often extending significantly higher.

The Plasticity Index (PI), which represents the plasticity of the soil (calculated as the difference between the Liquid Limit and the Plastic Limit), is also an important parameter. CH soils usually exhibit high values for PI, often indicating significant plasticity. The specified range for CH soils often corresponds to LL values typically above 60 and PI values indicating a high degree of plasticity.

The choice indicating LL = 63 and PI = 38 fits well within the expected range for CH soil classifications. This selection reflects both the high liquid limit, signifying the soil's ability to retain water and remain workable in various conditions, as well as the considerable plasticity indicated by the PI value. These values are characteristic of cohesive soils with high clay content, making them suitable for engineering classifications and understanding soil behavior under different moisture conditions.