No laboratory criteria are established for these soils, as they generally can be readily identified in the field by their distinctive color and odor, spongy feel, and fiequently, fibrous textures. Particles of leaves, grass, branches, or other fibrous vegetable matter are common components of these soils. To see how the coefficient of uniformity is determined, let s consider an example. Grain size distribution chart. You should plot these values on a form like the one shown in figure 16-4.
Vertical coordinates are percents passing.
D 60 means the grain size, in millimeters, indicated by the gradation curve at the 60-percent passing level. You read about 1.25mm. D 10 means, similarly, the grain size indicated by the gradation curve at the 10-percent passing level. In figure 16-4, this is about 0.11mm. Integrated Publishing's Official Web Page Click here for a current index of everything on this web site.