1 / 31

Soil and weathering lab

Soil and weathering lab. Niti Mankhemthong 15/10/10. Roundness? Grain size? Sorting ?. Channel flow vs flow velocity vs sediment load & clasts. Speed water flow and Size???. 2. 1. 2. Texture Grain Sorting Grain Rounding. Coarse-grained textures. Grain Size.

hinto
Télécharger la présentation

Soil and weathering lab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Soil and weathering lab NitiMankhemthong 15/10/10

  2. Roundness? • Grain size? • Sorting? Channel flow vs flow velocity vs sediment load & clasts

  3. Speed water flow and Size???

  4. 2 1 2

  5. Texture Grain Sorting Grain Rounding Coarse-grained textures

  6. Grain Size

  7. Sorting or Graduation

  8. Grain Roundness or Particle shape

  9. Look at a descriptive handout

  10. Observational data in terms of fluid velocity and grain size:

  11. ~ 100 g 1 cm height Mixed with little water (2 spoon water ) Weight the dry clay (sieve no. 45 (~0.33 m))

  12. TAP!! 25 TIMES Add ½ spoon water each turn If you do not get Weight the final wet samples

  13. Weight of wet sample and bowl Weight of day sample A B C = B – A D Weight sample – dry sample E = C- D F %= (E/D) * 100 LL=F Water/dry sample COMPARE results among GROUP in class

  14. Plastic limit The plastic limit (PL) is the water content where soil starts to exhibit plastic behavior. A thread of soil is at its plastic limit when it is rolled to a diameter of 3 mm or begins to crumble. To improve consistency, a 3 mm diameter rod is often used to gauge the thickness of the thread when conducting the test. Distilled water until the soil is at a consistency where it can be rolled without sticking to the hands. around20 g

  15. If you don’t get it!! Then, weight the crumbles

  16. Repeat all steps at least 3 times until get the sample at least 60 grams In this experiment, let 1 student do 1 sample of 20 g. Thus, we will have 60 g sample for Plastic limit calculation

  17. Weight of wet sample and bag Weight of day sample (from baking) A B C = B – A D Weight sample – dry sample E = C- D F %= (E/D) * 100 PL=F Water/dry sample

  18. Clay didn’t merge After 25 taps Mix water with clay Part 1 Then, add more water in bowl until Liquid limit determination Clay merge together ~0.5” wide STOP!! SUMMARY of LL and PL concepts Can roll clay into ½ diameter size Mix too much water with clay Solid behavior Plastic behavior Liquid behavior Part 2 Roll more to dry clay until Plastic limit determination Cannot roll it anymore (break a part) STOP!! Dry soil Plastic limit Liquid limit Wet soil 0 Max Water content

  19. Hint: We have clay and sand samples

More Related