1.5. Field Identification of Soils

Try these first

1. 1.

   What does the color of soil generally indicate?

   Hint

   Think about what dark colors might imply.

2. 2.

   Name the three main soil textures.

   Hint

   These textures describe how the soil feels.

3. 3.

   What does a darker soil color typically suggest?

   • Higher mineral content
   • More organic matter
   • Poor drainage

   Hint

   Think about what organic materials look like.

4. 4.

   True or False: The Toughness Test helps determine if the soil is plastic or brittle.

   • True
   • False

   Hint

   Consider how materials react under pressure.

5. 5.

   Given a soil sample that is dark in color and clay-like in texture, what inferences can you make about its potential for being used as a subgrade material in pavement?

   Hint

   Consider how organic materials affect soil behavior in wet conditions.

6. 6.

   If during the Toughness Test a soil behaves plastically, how might this influence the design of pavement structures?

   Hint

   Think about how deformation impacts the longevity and stability of the pavement.