Which coefficient is indicated as Cc in soil classification?

• A. Coefficient of compressibility
• B. Curvature coefficient
• C. Coefficient of consolidation
• D. Coefficient of uniformity

Answer: (B)

The coefficient indicated as Cc in soil classification refers to the curvature coefficient. This coefficient is utilized in the context of grading soils, particularly in understanding the particle size distribution in soil samples. The curvature coefficient provides insight into the shape of the grading curve and helps to determine the uniformity and void ratio of the soil. A higher curvature coefficient suggests a less uniform soil mixture which has a better packing efficiency due to the presence of a range of particle sizes, while a lower value indicates a more uniform distribution that can result in poorer compaction and less strength.

The curvature coefficient is an important parameter in soil mechanics and geotechnical engineering, as it helps engineers and geologists evaluate the properties of soil and its suitability for construction projects. Understanding Cc helps in soil classification, necessary for predicting the behavior of soil under different loading conditions.

In contrast, the other choices refer to different coefficients that are important in soil mechanics but do not correspond to Cc. The coefficient of compressibility pertains to the ability of soil to undergo volume change when subjected to loading, the coefficient of consolidation relates to the rate at which saturation happens in soil due to water flow, and the coefficient of uniformity indicates how well-graded a soil sample is based on its particle size distribution.