gravel

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Related to gravels: pea gravel, fine gravel, Crusher run

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 classic literature ?
On the instant he struck, Lute lightly touched his neck with the rein, impelling him to the left; and in that instant, tottering on the insecure footing, with front feet slipping over into the pool beyond, he lifted on his hind legs, with a half turn, sprang to the left, and dropped squarely down to the tiny gravel bed.
Tenders are invited for Extension socket system gravels Baumeisterarbeiten
Medium-grade gravels tend to be easier to walk on than smaller grades, rounded pea shingle or large cobbles.
ABSTRACT--Textural and compositional data from gravels in the Western Valley of the Tennessee River show that Cretaceous gravels can be distinguished from Pliocene-Quaternary gravels.
Since these fine gravels can become muddy when they get wet, many landscape contractors add a soil stabilizer to bind the fragments so they resist water damage.
Instead, the company mixed high-grade gravel from the upper 30 feet with the lower quality gravel from above and beneath the massive clay bed, thereby completely obscuring the true quality of the two deeper gravels.
Frequently, gravels are named after the regions where they were quarried.
TSX VENTURE:DGM) ("Diagem" or the "Company") reports that the preliminary results of 40 bulk samples of the in situ eluvial gravels overlying the Collier-04 kimberlite pipe have been received.
These latest results compare favorably to the diamond recoveries generated from the Company's initial sample of the basal gravels, which produced 27 diamonds with a total combined weight of 7.
Diagem" or "the Company") (TSX VENTURE:DGM) is pleased to announce that the evaluation of the Collier-04 kimberlite pipe and its overlying gravels has commenced.
The depth of the gravels encountered during the drilling program varied between 0.
26 carats per cubic meter for the basal gravels at Duas Barras.