Q-What are the different types of Sand?
A-Sand is a granular material made up of fine mineral particles. It is a naturally occurring, finely divided rock. Sand comprises particles, or granules, ranging in diameter from 0.0625 (or 1⁄16 mm) to 2 millimeters. An individual particle in this range size is termed a sand grain. The next smaller size class in geology is silt: particles smaller than 0.0625 mm down to 0.004 mm in diameter. The next larger size class above sand is gravel, with particles ranging from 2 mm up to 64 mm (see particle size for standards in use). Sand feels gritty when rubbed between the fingers (silt, by comparison, feels like flour).
Sand is commonly divided into five sub-categories based on size;
- very fine sand (1/16 – 1/8 mm diameter)
- fine sand (1/8 mm – 1/4 mm)
- medium sand (1/4 mm – 1/2 mm)
- coarse sand (1/2 mm – 1 mm)
- very coarse sand (1 mm – 2 mm)
These sizes are based on the Φ sediment size scale, where size in Φ = -log base 2 of size in mm. On this scale, for sand the value of Φ varies from -1 to +4, with the divisions between sub-categories at whole numbers.
Uses of sand:
- Concrete Sand is often a principal component of concrete.
- Molding Sand, also known as foundry sand, is moistened or oiled and then shaped into molds for sand casting. This type of sand must be able to withstand high temperatures and pressure, allow gases to escape, have a uniform, small grain size and be non-reactive with metals.
- Sand It is the principal component in glass manufacturing.
- Graded sand is used as an abrasive in sandblasting and is also used in media filters for filtering water.
- Brick manufacturing sand plants use sand as an additive with a mixture of clay and other materials for manufacturing bricks.
- Sand is sometimes mixed with paint to create a textured finish for walls and ceilings or a non-slip floor surface.
- Sandy soils are ideal for certain crops such as watermelons, peaches, and peanuts and are often preferred for intensive dairy farming because of their excellent drainage characteristics.
- Sand is used in landscaping; it is added to make small hills and slopes (for example, golf course sand).
- Beach nourishment – transportation to popular beaches where seasonal tides or artificial changes to the shoreline cause the original sand to flow out to sea.
- Sandbags are used for protection against floods and gun fire. They can be easily transported when empty, then filled with local sand.
- Railroads use sand to improve the traction of wheels on the rails.
Defined by wikipedia
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