gravel

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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 ?
Tenders are invited for Perform structural demolition of five (5) structures, structures shall be removed to ground level to include slabs and foundations, contractor shall be responsible for backfilling and grading for proper drainage and seeding and mulching all disturbed areas, contractor shall backfill area to existing surrounding grade where fuel island slab was with crusher run stone, contractor shall be responsible for storing, removing and disposal of all material and debris from site.
30,000 tons, more or less, gravels #2, 4, 6, 8, 9, 57, 67, 304, 411, B10 or Crusher Run.
25 Thick ; 150 LF Directional Bore for 8 PE SDR 11 ; 311 SY Gravel Repair ; 12 SY Asphalt Repair ; 177 SY Concrete Repair ; 765 TON 1 Crusher Run ; 657 TON Embendment ; 1,502 SY Solid Slab Sodding (6~ Wide).
Tenders are invited for Materials needed: 2rc, bank run, cobblestone, #2, #3, t#4, #6 stone, #1-2 screened mix, #1 washed crushed, #2 washed crushed, #2 crushed stone, #57 crushed stone, 1, 2, 3 crusher run, 1a, 2a, 3a limestone, 3-5 entrance rock, rip rap, crushed 1b stone, gabion stone and shale.