Table of Contents
- 1 What are the differences between coarse-grained and fine grained soils?
- 2 What is the grain size that divides coarse-grained soils and fine soils answer in millimeters?
- 3 Why fine grained soil have more voids?
- 4 Which soils are fine grained soils?
- 5 What is the specific gravity of fine grained soil?
- 6 Why is the void ratio of fine-grained soil higher than coarse soil?
- 7 What is meant by fine-grained soil?
What are the differences between coarse-grained and fine grained soils?
Coarse-grained soil is described on the basis of its gradation (well or poor), particle shape (angular, sub-angular, rounded or sub-rounded) and mineralogical components. Fine-grained soil is described depend on its dry strength, dilatancy, dispersion and plasticity.
What is the grain size that divides coarse-grained soils and fine soils answer in millimeters?
The borderline between coarse and fine grained soils is 0.075 mm, which is the smallest grain size one can distinguish with naked eye.
Why fine grained soil have more voids?
But in fact, the fine-grained soil has more void ratio as compared to the coarse-grained soil. It is because of the concept of the surface area of the particle. The surface area of the fine-grained soils with respect to the soil mass is more as compared to the surface area of the coarse-grained soil.
Why is void ratio important?
The minimum void ratio is an important parameter for evaluating soil properties. The more irregular the particle shapes, the more complicated the contact between particles, the more the void existed between the particles, and the larger the minimum void ratio.
What is the difference between void ratio and porosity?
Void ratio is usually defined as the ratio of the volume of voids to the total volume of soil solid. Porosity is defined as the ratio of the volume of voids to the total volume of the soil.
Which soils are fine grained soils?
Silt and clay are fine grained soils. All fine grained soils exhibit, to some degree, the properties of plasticity and cohesion. Gravel makes up the larger fraction of the coarse grained soils. Most gravels have a distinctly rounded shape and are smooth to the touch.
What is the specific gravity of fine grained soil?
between 2.65-2.80
The Specific Gravity of soils is usually between 2.65-2.80 with finer soils having higher values than coarser ones.
Why is the void ratio of fine-grained soil higher than coarse soil?
The reason is that the fine-grained soil has got very very finely divided particle which has got some chemical repulsions taking place. These chemical replulsions will not allow the particles to come closer that make the void ratio of the fine grained soils to be on the higher side compared to coarse grained soils.
Which has more volume of voids gravel or clay?
Therefore clay has more volume of voids than gravel (fine grained soil has more volume of voids than coarse grained soil) always remember the voids of fine grained soil are small in size but very large in number that increases volume of voids in fine grained soil.
How do you identify coarse grained soil?
When the fine content is in the range of 12-50\%, it is a coarse grained soil with substantial fines. The soil is assigned a symbol XY where X is the major coarse grained soil present and the descriptor Y is the symbol of the fines present. A soil in this case can be GM, GC, SM or SC.
What is meant by fine-grained soil?
Fine-grained soil is described depend on its dry strength, dilatancy, dispersion and plasticity. It has good-load bearing qualities when dry; however, it possesses little or no load-bearing strength if it is wet. This characteristic is especially true with clay.
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