Gravel

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Gravel is a loose rock fragment aggregation. Gravel is classified by particle size and includes a class of sizes from granules to rock-sized pieces. In Udds-Wentworth scale gravels are categorized into granular pebbles (2-4 mm or 0.079-0.157 deep) and gravel pebbles (4 to 64 mm or 0.2 to 2.5 inches). ISO 14688 gravel is smooth, medium, and rough with a range of 2 mm to 6.3 mm to 20 mm to 63 mm. One cubic meter of gravel typically weighs about 1,800 kg (or one cubic yard weighs about 3,000 pounds).

Gravel is an important commercial product, with a number of applications. Many highways are graveled, especially in rural areas where there is little traffic. Globally, more gravel-lined roads than concrete or asphalt; Russia alone has over 400,000 km (250,000 mi) of gravel roads. Sand and small pebbles are also important for the manufacture of concrete.

Video Gravel

Geology

Large gravel deposits are a common geological feature, which is formed as a result of weathering and rock erosion. River and wave action tend to accumulate gravel in large accumulations. This can sometimes cause the pebbles to be compacted and stacked into sedimentary rocks called conglomerates. Where natural pebble deposits are inadequate for human purposes, gravel is often produced by excavation and destruction of hard rocks, such as sandstone, limestone, or basalt. Quarry where gravel is extracted is known as a gravel pit. Southern England had enormous concentrations of them due to the widespread deposition of gravel in the region during the Ice Age.

Modern production

In 2006, the United States was the world's leading producer and consumer of gravel.

Maps Gravel

Etymology

The word pebble comes from the Breton language. At Breton, "grav" means beach. Adding the "-el" suffix in Breton shows component parts of something larger. So "pebbles" means small stones that form such beaches on the beach. Many dictionaries ignore the Breton language, quoting the old French gravele or gravelle .

Gravels often have the mean of a mixture of different sizes of stones mixed with sand and maybe some clay. In American English, small, sandless stones mixed are known as crushed stone.

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Type

Types of pebbles include:

• Bank pebbles : naturally deposited gravel is mixed with sand or clay found inside and next to rivers and streams. Also known as "bank run" or "river run".
• Bench's Gravel : a pebble located on the valley side above the current river bed, indicating the location of the former flow bed when it is at a higher level.
• River rocks or river rocks : These stones are generally round, semi-polished, potentially of various types, dredged or taken from flow beds. It is also often used as a concrete aggregate and less often as a paving surface.
• The stone is destroyed: the stone is crushed and scored by the screen and then mixed into a mixture of stones and fines. It is widely used as a surface for roads and driveways, sometimes with tar applied over it. The crushed stone can be made of granite, limestone, dolostone, and other stones. Also known as "crusher run", DGA (solid grade aggregate) QP (quarry process), and a shoulder rock.
• Fine pebbles : gravel consisting of particles 2 to 8 mm in diameter.
• Oldest pebbles : accumulated rough pebble surfaces generated by smoother particle removal.
• Pay pebble : also known as "pay dirt"; a nickname for pebbles with high concentrations of gold and other precious metals. The metals were discovered through gold repeats.
• Pebble nuts : pebbles made up of small round stones used in concrete surfaces. Also used for sidewalks, driveways, and as a substrate in a home aquarium.
• Piedmont Pebbles : rough pebbles brought down from high by mountain streams and deposited on relatively flat soil, where water flows more slowly.
• Plateau gravel : a layer of gravel in the highlands or other areas above the altitudes where gravel streams are commonly found.

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Relationship with plant life

In places where gravel is dominant, plant life is generally less frequent. This result is derived from the inferior gravel ability to retain moisture, as well as the corresponding mineral nutrient deficiency, because the finer soils containing the minerals are present in smaller amounts.

src: www.watsongravel.com

See also

• Aggregate construction
• Pebble
• Rock

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References

src: www.fls-pgh.com

External links

Media related to Pebbles in Wikimedia Commons

Source of the article : Wikipedia