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29 Cards in this Set
- Front
- Back
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Sieve range for Cobbles?
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12-in (300mm)
TO 3-in (75mm) |
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Sieve range for Boulders?
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Greater then 12-in (300mm)
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Sieve range and Properties for Clay?
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-Less then No. 200 (75μm)
-Plasticity (Over A-line) -Pi Greater Than 4 -Strong when dry |
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Sieve Sub-ranges for Gravel?
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Coarse Gravel
3-in (75mm) to 3/4-in (19mm) Fine Gravel 3/4-in (19mm) to No. 4 (4.75mm) |
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Silts and clays are considerd organic if their LL after oven dring is less than ________% of the LL before oven drying.
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75%
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For Peat What is the typical:
Material odor color |
Material - vegitation
odor - organic odor color - Dark brown to black |
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Sieve range for Sand?
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no. 4 (4.75mm)
to No. 200 (75μm) |
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Sieve Sub-ranges for Sand?
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Coarse
no. 4 (4.75mm) TO No. 10 (2.00mm) Medium No. 10 (2.00mm) TO No. 40 (425μm) Fine No. 40 (425μm) to No. 200 (75μm) |
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Sieve range and Properties for Silt?
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-Less then No. 200 (75μm)
-Plasticity (Under A-line) -Pi Less than 4 -Weak when dry |
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What are the 4 types of Angularity?
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Angular
Subangular Subrounded Rounded |
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What ratio determinse whether a particle shape is long or flat?
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1/3
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Name the Moisture Conditions.
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Dry
Moist Wet |
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What type of soil is described by its relative density and what type of soil is described by its relative Consistency?
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Cohesive soil = Relative Consistency
Very soft to Hard Non-cohesive Soil = Relative Density Very Loose to Very Dense |
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What are the soil structures of intact Soils?
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Stratified
Laminated Fissured Slickensided Blocky Lensed Homogeneous |
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Stratified
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Alternating Layers 6mm thick or more.
Note Thickness |
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laminated
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Alternating layers Less than 6mm thick,
Note Thickness. |
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Fissured
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Breaks Along Planes of Fractures.
Little resistance to Fracture. |
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Slickensided
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Fracture planes appear Polished or glossy.
Some times Striated. |
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Blocky
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Cohesive soil that break into smaller angular pieces that resist further break down.
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Lensed
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Inclusion of small pockets of different soils.
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Homogeneous
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same throughout.
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What information about particle size needs to be inserted into the soil description?
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Soil particle size ranges.
Maximum Sieve passed for Sand, Gravel, Cobble. |
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Coarse grains are hard when...
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Can't be broken with one hammer blow.
Note if it Cracks, fractures, or crumbles. |
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What Additional Comments should be added to soil description?
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Roots
Root holes Presence of Mica Difficulty drilling |
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Outline for determining Dry Strength of Fine-grain Soils.
Levels of dry strength. |
1-inch ball. Three 1/2-Inch ball
None - Handling pressure Low - Low Finger Pressure Medium - High Finger Pressure High - Thumb/Surface Pressure Very Hard - Thumb pressure insuficient |
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Dilatancy test outline
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1/2-inch ball - shake then squeeze.
None - No Visible change Slow - Water appears Slowly; slow or no disappear. Rapid - water appears quickly; disappear quickly |
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Toughness Test outline
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Roll/fold 1/8-inch (3mm) Diameter thread
-Plastic limit when thread crumbles at 1/8-inch diameter. -Note Pressure to roll and strength of thread. -Note the Pressure as Low, medium or high. |
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Plasticity
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After Toughness Test
NonPlastic = 1/8-inch thread cant be rolled Low = Barely Roll Thread Medium = PL reached quickly. Lump crumbles High = PL Reached slowly. |
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What are the 15 items in the Check list?
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1. Relative Density /Consistency,
2. Color, 3. Group Name 4. (Group Symbol); 5. Moisture; 6. Cobbles / Boulders by % by volume; 7. Gravel / Sand: % by dry weight; 8. Fines % by dry weight; 9. organics: % by Volume, type; 10. Strucutre: 11. Cementation; 12. Odor (Petroleum, Organics); 13. HCl Reaction; 14. Additional Comments (Drilling, Heave, Caving) 15. unit Name. |
