The uniformity coefficient (Cu) and the coefficient of gradation (Cc) are the measures of soil gradation. These coefficients help to classify the soil as well graded or poorly graded ones.

What is coefficient of uniformity of soil?

Uniformity Coefficient (Cu) which is a measure of the uniformity of grain size in the soil and is defined as the ratio of the 60% finer size (D60) to D10.

What does the coefficient of curvature tell us?

It is the parameter estimated using the gradation curve through sieve analysis. The diameter taken from gradation curve for which the 10% particles are finer is known as effective size. ... When the value of C C is in between 1 and 3, the sand or gravel is said to be well graded.