Faculty & Staff Profiles

Soil Gradation

Geology and Soil Mechanics, UW-Stout

Gradation Curve

Consider the following measurements obtained from a mechanical grain size analysis using sieves.  Can you determine the mean size (D50), effective size (D10), coefficient of uniformity (CU), and the coefficient of curvature (CC) for this data?

 

U.S Sieve Size

Weight Retained (g)

3/8 in.

43

No. 4

195

No. 10

281

No. 40

127

No. 100

44

No. 200

25

pan (<0.075mm)

135


Gradation curve graph

gradation_1


Here is the solution.