Talk:Black Hole Cheer

Seive Lab

Purpose

The purpose of this experiment is to introduce the methods used in a mechanical particle size analysis of a certain soil sample. The gradation of a soil is useful in soil classification.

Equipment & Materials

• Set of sieves
• Sieve brushes
• Balance sensitive to 0.1 g
• Supply of thoroughly dried soil

Procedure

• • 1. Thoroughly clean sieves using coarser bristles for No. 4 – 40 sieves and finer bristles for all the smaller sieves.
  • 2. Assemble sieves in order of descending diameters
  • 3. Weigh a dry, empty metal container
  • 4. Weigh approximately 800 g of representative soil mixture
  • 5. Pour soil into cone shaped pile on clean surface and quarter soil with large spatula
  • 6. Combine two quarters in same metal container used above and weigh sample
  • 7. Pour soil into stack of sieves
  • 8. Place sieve stack into MaryAnn shaker for 6 minutes
  • 9. Remove sieves from mechanical shaker and weigh amount of soil retained on each sieve.
  • 10. Repeat test with other two quarters of sample

Calculate

• • 1. Percent retained and passing each sieve
  • 2. Plot Grain Size Distribution curve
  • 3. Coefficients of Concavity & Uniformity

(obtained from Geotech Engineering lab - "Grain Size Analysis." Malinski 23:57, October 21, 2007 (EDT)