Wentworth scales are used for what purpose with what type of rock?
Classification of seds and sedimentary rocks in clastica
Describing soils in the field should include:
- Main sed type (all caps)
- Minor components (lower case)
- colour (adjective)
- Moisture content (dry, moist)
- Consistency (soft, stiff)
- Density (coarse grained only)
- Geologic origin (fluvial, glacial till)
- Foreign material (concrete)
- Odour (HC odours)
- Presence of contaminants (HC staining soil)
If the jar test produces 3 distinct layers then what is present?
Sand silt and clay
How do you name jar test soils
Using usda soil texture triangle
What sieve range is sand
10- 200
What is used to separate silt and clay after a sieve test?
Hydrometer
Calculation for % retained in a sieve test
% retained = m sieve /total mass x 100%
Calculation for % finer
% finer = 100- sum of % retained on sieve and above
Classification of fine grained soils is based on:
- Grain size
2. Plasticity
What does cohesiveness describe?
The ability of a soil to be reshaped in the presence of some moisture, without crumbling
What % of clay does soil need to be cohesive?
8-12 %
At low and high moisture content how of cohesive materials
Low moisture - solid
High - liquid
Are consolidated sediments affected by water content?
No
Define plastic limit
PL
The moisture content (%) of a soil at which it will crumble when rolled into 1/8 inch diameter threads
Define liquid limit
The moisture content (%) of a soil required to close a distended of 0.5 inches along the bottom of a groove after 25 blows
