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 periodicals archive ?
Once established, a gravel garden featuring drought-tolerant plants such as phormium, blue grass, iris, alpine pinks and sempervivum needs almost no maintenance.
The Tuscaloosa gravels are thought to be derived from the Pascola Arch area, and transported southeastward by streams.
At as little as 25 cents per square foot, gravel beats an installed wood, concrete, or brick surface hands down.
As a scientist specializing in mineral resource geology, I have volunteered my time throughout the past 22 months to evaluate all of the drilling and other geologic data on this gravel case, and I have submitted several reports of my findings.
At its best, gravel harmonizes with the plants, buildings, and other aspects of a garden's overall design--as it does in the traditional Japanese garden of raked gravel and boulder "islands" shown here.
The target basal gravels are overlain by a two to three metre thick sequence of white gravel which is also diamond-bearing.
A second sample site, situated 800 metres to the west of Pit #1 is currently being excavated, to allow for the evaluation of diamond grades within the alluvial gravels comprising the western portion of the deposit.
The Company wishes also to clarify a statement in its May 9th 2005 press release which read "The mining concession permits mining of kimberlite and gravel deposits that have been proven to be payable over the entire 10,000 hectare property".
One hole returned over 100 gold grains from a 3m gravel interval.
The diamonds produced from alluvial gravels along the Jequitinhonha River are predominantly gem-quality cuttable goods, with typical sales values ranging between US$150 to US$250 per carat.
00670 cubic yards of material per foot of penetration into the gravels.
Two Banka drills are operating to sample high terrace gravels identified as diamondiferous in earlier work by the National Diamond Mining Company of Sierra Leone and by the Geological Survey of Sierra Leone.