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1. The strength of a Soil type
soil, or the ability to Soil density
compact a soil into a The amount of water in the soil
suitable construction
material will depend
on?
2. Types of soils Gravel (mm to cm's in size)
Sand (mm in size)
Silt (fine particles with little cohesion)
Clay (has cohesion, can stick together)
Organic soils (peat, topsoil)
3. Organic soils (O) Have a large componet of dead or decaying plants, and are not used in
construction
4. Silt and Clay Classified based on whether the soil is plastic (clay) or non-plastic (eg. can
you roll it into a ball or string)
5. Gravel and Sand are classified based on whether or not all the particles are roughly the
same size (uniform, like a beach) or if there is a large variety in particle size
(well-graded).
6. Soil layers 1. (complex zone) 3 to 4m
2. (glacio-lacustrine clay) 2-12m
3. Glacial till, up to 9m in thickness
4. Carbonate bedrock, the upper surface of which is often fractured, weath-
ered and irrgular
7. Soil has two com- Cohesion (clay only)
ponets of strength Friction (when individual soil grains move across on another)
, ICC (EC) Soils - Material Testing (edit), combined
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8. The three types of general shear failure (bulging / tilting)
shear failure of soil local shear failure (slight bulging)
are punching shear failure (little to no bulging)
9. Soil strength is used The bearing capacity of a foundation
to determine The stability of natural or man-made earth slopes or retaining walls
10. Test for soil strength Unconfined compression test
include; Direct shear test
Triaxial compression test
11. Soil strength de- density and moisture content
pends upon
12. Unconfined com- useful for determining the strength of soils
pression test
13. Gradation refers to Boulders ( >12" )
the range of mea- Cobble ( 3" to 12" )
sured soil particle Gravel ( >2 mm )
sizes. Gradation re- Sand ( 0.075 to 2 mm )
sults in classifying Silt ( 0.002 to 0.075 mm )
soil types as Clay ( <0.002 mm )
14. The particle size Mechanical sieve analysis
distribution of
coarse-grained soils
is typically deter-
mined by?
15. The particle size hydrometer analysis
distribution of
, ICC (EC) Soils - Material Testing (edit), combined
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fine-grained soil is
determined using a ?
16. Two parameters help The Coefficient of Uniformity (Cu)
to identify soils that The Coefficient of Curvature (Cc)
are well-graded?
17. The hydrometer slit and clay-sized particles.
analysis is used to
determine the gra-
dation of
18. Only soil particles hydrometer analysis
passing the # 40
sieve (0.425) are
used in the
19. Hydrometer read- The specific gravity, or density, of the fluid tells us the % of material still in
ings give us two suspension.
things?
The average downward velosity of the hydrometer can give us the diameter
of the particle that is just coming out of solution.
20. The Swedish soil sci- Albert Atterberg
entist, _____ , de-
veloped a method
of quantitatively de-
scribing the effect
of soil moisture on
the consistency of
fine-grained soils.
21.