ICC (EC) Soils - Material Testing (edit), combined Exam Questions and ANSWERS

ICC (EC) Soils - 7b 7b 7b



Material Testing (edit), combined
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1. The strength of a soil, or the ability to compact a soil into a suitabl
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e construc-tion material will depend on?: Soil type
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Soil density
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The amount of water in the soil
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2. Types of soils: Gravel (mm to cm's i 7b 7b 7b 7b 7b 7b 7b




n size) Sand (mm in size)
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Silt (fine particles with little cohesi
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on) Clay (has cohesion, can stick t
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ogether) Organic soils (peat, top
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soil)

3. Organic soils (O): Have a large componet of dead or decaying plants, and are not used in c
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onstruction
4. Silt and Clay: Classified based on whether the soil is plastic (clay) or non-
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plastic (eg. can you roll it into a ball or string)
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5. Gravel and Sand: are classified based on whether or not all the particles are roughly the sam
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e size (uniform, like a beach) or if there is a large variety in particle size (well-graded).
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6. Soil layers: 1. (complex zone) 3 to 4m
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2. (glacio-lacustrine clay) 2-12m 7b 7b




3. Glacial till, up to 9m in thickness 7b 7b 7b 7b 7b 7b




4. Carbonate bedrock, the upper surface of which is often fractured, weathered and irrgular
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7. Soil has two componets of strength: Cohesion (cl
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ay only) Friction (when individual soil grains move across on anot
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her)
8. The three types of shear failure of soil are: general shear failure (bulgi
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ng / tilting) local shear failure (slight bulging)
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punching shear failure (little to no bulging)
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9. Soil strength is used to determine: The bearing capacity of a fo
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undation The stability of natural or man-made earth slopes or retaining walls
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10. Test for soil strength include;: Unconfined com 7b 7b 7b 7b 7b 7b




pression test Direct shear test 7b 7b 7b 7b




Triaxial compression test
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, ICC (EC) Soils -
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Material Testing (edit), combined
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11. Soil strength depends upon: density and moisture content
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12. Unconfined compression test: useful for determining the strength of soils
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, ICC (EC) Soils - 7b 7b 7b



Material Testing (edit), combined 7b 7b 7b 7b




13. Gradation refers to the range of measured soil particle si 7 b 7 b 7 b 7 b 7 b 7 b 7 b 7 b 7 b




zes. Gradation results in classifying soil types as: Boulders ( >12" )
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obble ( 3" to 12" ) Gravel 7b 7b 7b 7b 7b 7b 7




( >2 mm ) b 7b 7b 7b




and ( 0.075 to 2 mm ) Si 7b 7b 7b 7b 7b 7b 7b




lt ( 0.002 to 0.075 mm 7b 7b 7b 7b 7b 7b




) Clay ( <0.002 mm ) 7b 7b 7b 7b 7b




14. The particle size distribution of coarse- 7 b 7 b 7 b 7 b 7 b




grained soils is typically determined by?: Mechanical sieve analysis 7 b 7 b 7 b 7 b 7b 7b 7b 7b




15. The particle size distribution of fine- 7 b 7 b 7 b 7 b 7 b



grained soil is determined using a 7 b 7 b 7 b 7 b 7 b




?: hydrometer analysis 7b 7b




16. Two parameters help to identify soils that are well- 7b 7b 7b 7b 7b 7b 7b 7b




graded?: The Coeflcient of Uniformity (Cu) 7b 7b 7b 7b 7b




The Coeflcient of Curvature (Cc) 7b 7b 7b 7b




17. The hydrometer analysis is used to determine the gradation of: s 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b




lit and clay-sized particles. 7b 7b 7b




18. Only soil particles passing the # 40 sieve (0.425) are used in t 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b




he: hydrometer analysis 7b 7b




19. Hydrometer readings give us two things?: The specific gravity, or density, o 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b 7b




f the fluid tells us the % of material still in suspension.
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The average downward velosity of the hydrometer can give us the diameter of the particle that is just co
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ming out of solution. 7b 7b 7b




20. The Swedish soil scientist, , dev 7b 7b 7b 7b 7b




eloped a method of quantitatively describing the effect of soil mo 7b 7b 7b 7b 7b 7 b 7 b 7 b 7 b 7 b




isture on the consistency of fine-grained soils.- 7 b 7 b 7 b 7 b 7 b 7 b




: Albert Atterberg 7b 7b




21. Although Atterberg proposed five limits only the following 7b 7b 7b 7b 7b 7b 7b




three are in common useage today.: Liquid Limit
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lastic limit Shrinkag 7b 7b




e limit 7b




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