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 classic literature ?
If I did not reason as I do in regard to this gravel," he went on, "I should have to assume a balloon
But if he did shut the window, it was because of the bend in the gravel path, a dozen yards from the pavilion, and on account of the three oaks that are growing at that spot.
A giant boulder prevented direct access to the gravel bed.
He can't make that side-jump to the gravel," Chris warned.
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.
Being old and sly, I forbore to call out; but being also, unfortunately, old and heavy, my feet betrayed me on the gravel.
His mouth wore its bitterest expression, his severe brow its hardest and deepest fold, as he drew down his hat farther over his eyes to shelter them from the sun, and thrusting his hands deep into his pockets, began to walk up and down the gravel.
TAKE your inspiration from the wild and substitute grass for gravel with drought-tolerant flowers like poppies or lady's mantle, eryngium, euphorbia and verbascum randomly planted through it.
Gravel to discontinue any sacramental actions for the duration of his political career; in other words, to discontinue for a while, his priestly services.
They think it's an economic hardship because they have clients that require continuous pours, continuous supplies of sand and gravel, where if certain pours are interrupted (the job) is ruined .
NSSGA Automation Conference & Expo, Chicago, National Sand, Stone and Gravel Association, (800) 342-1415
He says the City of Greater Sudbury is the primary customer for his client's gravel.