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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

Gravel

Small pieces of stone that are of varying sizes; used as an ingredient in concrete.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

gravel

[′grav·əl]
(geology)
A loose or unconsolidated deposit of rounded pebbles, cobbles, or boulders.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
'Our major source of sand and gravel are the rivers but we would like to shift to mountain quarries like basalt.
On his part, the Deputy Minister of Marginalised Communities, Royal /Ui/o/oo also a resident of Tsumkwe said once the C44 gravel road is upgraded to a bitumen standard, Tsumkwe would then start to experience economic growth and employment opportunities.
From that beginning was born the Mississippi Gravel Cup.
Sand and gravel mining, concrete recycling and mined land reclamation.
Fill dirt is a necessary component of pea gravel patios.
Angeles also said that quarrying on mountainous areas will be the next option once sand and gravel on the river beds are depleted.
Because both the nature of clay and gravel can be shown in the mixtures of red clay and gravel, the particle diameter of the gravel is larger than the maximum size standard stipulated of gravitational compaction experiment.
In Oregon, the task of restoring old gravel pits, if carried out, is almost always done at the public's expense by nonprofit or government groups.
In a memorable photograph from the 1970s, Mike Gravel sits astride the trans-Alaska oil pipeline looking proud and confident about Alaska's coming oil bonanza and the economic security that would accrue to the state.
On the other hand, gravel fragments of parent materials can undergo impregnation by pedogenic oxides and clays, and hence, they can be erroneously identified as ironstones in some cases.
Companies that produce sand and gravel now face a tighter application process for an environment compliance certificate (ECC), which is an important permit needed to develop a prospect and bring it into production stage.
Alexandre Dumas, L'abbe Pierre Gravel : Syndicaliste et ultranationaliste, Quebec : les Editions du Septentrion, 2014.