5.2. Measurement of Particle Size Distribution

Try these first

1. 1.

   What method would you use to separate fine grains from coarse grains?

   Hint

   Think about which method uses water to assist in separation.

2. 2.

   What does D10 represent in soil analysis?

   Hint

   Recall the definitions of effective size.

3. 3.

   What is the primary objective of soil classification?

   • To provide a visual description
   • To categorize soils with similar behaviors
   • To measure densities

   Hint

   Think about why we need to categorize soils in engineering.

4. 4.

   True or False: Wet sieving is used for particles coarser than 75 microns.

   • True
   • False

   Hint

   Consider the particle sizes associated with each method.

5. 5.

   Analyze two soil samples, A and B. Sample A has an effective size of 0.25 mm and a uniformity coefficient of 8; Sample B has an effective size of 0.15 mm and a uniformity coefficient of 4. Which sample is better graded and why?

   Hint

   Recall the definition of uniformity coefficient.

6. 6.

   What effects might the particle size distribution have on the drainage capabilities of a soil? Write a short paragraph discussing your reasoning.

   Hint

   Consider how voids between particles impact fluid movement through soil.