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Soil_Classification_Basics.ppt

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Soil_Classification_Basics.ppt

  1. 1. Soil Classification Basics Dr. Mohanad Alfach Ph.D. in Earthquake Geotechnical Engineering
  2. 2. Contents • Soil Classification Systems • Criteria's of (USCS) soil classification  Soil Grain Sizes  Hydrometer analysis  Soil Plasticity – Atterberg Limits • AASHTO soil classification  Classification Steps according to AASHTO  Group Index (GI) Formula
  3. 3. Soil classification usually based on grain size and soil consistency. Several classification systems exist : 1- Unified Soil Classification System (USCS) according to (ASTM D2487-11) 2- American Association of State Highway and Transportation Officials AASHTO according to (ASTM D3282-09) 3-U.S. Department of Agriculture (USDA). 4- Burmister Soil Identification System. 5-Massachusetts Institute of Technology (MIT)
  4. 4. Sieve Analysis Grain Size Distribution, Cc, Cu Hydrometer Analysis Percent Clay (% < 2mm) Liquid Limit Plastic Limit Plasticity Chart PI LL Coarse-Grained •Gravel •Sand Fine-Grained •Silt •Clay Sieve Analysis Hydrometer Analysis Liquid Limit Plastic Limit Grain Size Distribution, Cc, Cu Percent Clay (% < 2mm) Plasticity Chart PI LL Steps of USCS Process
  5. 5. Mechanical Sieve Analysis (ASTM D422 , D1140 and AASHTO T88)
  6. 6. v d w s   m   18
  7. 7. In general…. PI Degree of Plasticity 0 Non plastic 1-5 Slightly plastic 5-10 Low plasticity 10-20 Medium plasticity 20-40 High plasticity 40+ Very high plasticity (from Burmister, 1949)
  8. 8. #200 #40 #10
  9. 9. Questions? Thanks for your time and attention!

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