Rubble

Gravel is both a technical term of geosciences for natural, predominantly boulders leading loose sediments and on the other a technical term of construction for coarse aggregates.

Technical term of Geosciences

In the geosciences gravel called a unconsolidated sediment, which has a share of more than 50 % rounded rock components with a grain diameter of more than 2 mm (called pebbles ), making it synonymous with the term gravel sediment. Since unconsolidated gravel are typical of geologically young, often quaternary deposit body. Your rounding have received the cobbles by surface abrasion at the frequent rearrangement in strongly agitated water, primarily in streams and rivers ( fluvial gravel ), by glacial melt water ( glazifluviale gravel ) or coastal (marine gravel ). To rock solidified gravel sediments are called conglomerates.

Unlike gravel include unconsolidated sediments, which have predominantly non- rounded rock components, referred to as debris. By glaciers transported and deposited material, which typically contains predominantly rounded part ( edge- rounded ) components is called attachment. In the Fluvialmorphologie, hydrology, engineering geology, and hydraulic However, river gravel are referred to as " attachment ".

Technical term in Construction

In construction, is referred to as gravel edged, broken minerals with a grain size of 32-63 mm, mostly for use in road construction. ( For round forms of this grain size is referred to in the building not of gravel, but gravel ). It is in the form of broken gravel aggregates, which are artificially produced as waste or quarries, or in crushing machines. Some of them are from naturally deposited unconsolidated sediments ( river gravels, glacial sediment ) produced in crusher plants.

Smaller aggregates are gravel and crushed stone, larger aggregates called Schroppen (including rubble, scree, Felszersatz ). In the industry of stones and earth rock groups of all sizes are generally referred to as breaker products.

Use of breaker products

In road gravel with graded grain sizes (stone sizes) among others for base courses of roads or binder is used (for example bitumen as asphalt with cement and water as concrete or cement- bound base ).

Gravel of different grain sizes can also serve as a frost protection layer beneath the paved road superstructure.

The term gravel is the description of a particular aggregate. The rules are commonly used in public road construction Specifications for rock in road construction (TL rock - tr ) in turn defines aggregate as granular material for use in construction, with aggregates of course, can be made or industrially recycled.

In the construction of railway tracks is a so-called ballast, also called ballasted, for frost- stabilization of the railway tracks.

In concrete ballast is used as an aggregate.