gravel


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Related to gravel: pebbles

gravel,

particles of rock, i.e., stones and pebbles, usually round in form and intermediate in size between sand grains and boulders. Gravel is composed of various kinds of rock, the most common constituent being the mineral quartz. Deposits of gravel are formed as a result of the weathering of rocks and the erosive and concentrating action of rivers and waves. Sometimes gravel becomes consolidated into the sedimentary rock called conglomerate. Gravel is used extensively in building roads and in making concrete. For road building it is crushed into angular particles of uniform size. One or more layers of gravel underlie the road surface. A small percentage of clay must be present to act as a binder when gravel is used in macadam for road surfaces. When used as a coarse aggregate for concreteconcrete,
structural masonry material made by mixing broken stone or gravel with sand, cement, and water and allowing the mixture to harden into a solid mass. The cement is the chemically active element, or matrix; the sand and stone are the inert elements, or aggregate.
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, gravel must be clean and free from clay and organic matter. Commercially, it is classified according to the size of the particles. In areas where natural deposits are inadequate, gravel is produced by quarrying and crushing durable rocks, such as sandstone, limestone, or basalt.

Gravel

Small pieces of stone that are of varying sizes; used as an ingredient in concrete.

Gravel

 

a loose conglomeration of pebbles. Cemented gravel is one type of conglomerate. According to the petro-graphical composition of the pebbles, gravel may be classified as polymictal (pebbles of different composition), oligomictal (pebbles of two or three rocks), or monomictal (homogenous pebbles). The petrographical composition, shape, arrangement, and location of pebbles in a pebble incline determine the genetic type of gravel and establish the position of material in eroded places as well as the direction in which it has been washed out. Gravel is used as a construction material, generally in road building.


Gravel

 

loose rock consisting of more or less rounded rock fragments and (less frequently) various minerals with a diameter of 1–10 mm (2–20 mm, according to other information). Gravel may be classified by size as fine (1–2.5 mm), medium (2.5–5mm) and coarse (5–10 mm). It is classified by origin as fluvial, lacustrine, marine, and glacial. Gravel is used as a construction material, a coarse concrete aggregate, and a road-building material. Cemented gravel is called grit.

gravel

[′grav·əl]
(geology)
A loose or unconsolidated deposit of rounded pebbles, cobbles, or boulders.

gravel

A coarse granular aggregate, larger than sand; formed either naturally or by crushing rock; will pass a 76.1-mm (3-in.) sieve and be retained on a 4.76-mm (No. 4) sieve.

gravel

1. an unconsolidated mixture of rock fragments that is coarser than sand
2. Geology a mixture of rock fragments with diameters in the range 4--76 mm
3. Pathol small rough calculi in the kidneys or bladder
References in periodicals archive ?
Like others before him, Gravel came to Alaska to find success.
Nomme vicaire a Thetford Mines en 1924, l'abbe Gravel commence a exercer ses talents d'orateur.
Gravel mine applications have been approved throughout the valley on Class I and II soils.
Gravel is an important commercial product, with a number of applications.
Winning locations include: Bloomington Crushed Stone, Interstate Sand & Gravel, Morgan County Sand & Gravel, Newton County Stone, Owen Valley Quarry (Spencer), Sieboldt Quarry (Springville) and Mitchell Crushed Stone.
However, he admits he is back in the learner bracket when it comes to the gravel.
It's important to prepare a new gravel garden carefully, breaking up compacted soil and incorporating plenty of organic matter to give plants a good start.
They are drought-resistant, attractive to butterflies and look their best planted en masse in gravel gardens.
Fine gravel or pea-shingle 1cm in diameter looks great, but it gets everywhere and can be used as cats' litter.
Crews from the Ruhlin Company work tirelessly gathering truckloads of sandy gravel and dumping the material to form a huge pile next to I-75 in Dayton.
Washington, Apr 12 (ANI): Instead of following speed limit criterions on various roads, people follow their own judgement to gauge how fast they should drive on gravel roads, according to a Kansas-based study.