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Crushed rock is the product of crushing rocks that are mined in open pits and processed into gravel by crushing (screening).

Crushed by its composition is divided into types: crushed gravel, crushed granite and crushed lime, as well as on the fraction, ie the separation of gravel on the size of stones. Chippings - fraction 5 / 20 (from 5 to 20 mm), medium 20/40, large 40/70. The biggest demand is gravel fraction 5 / 20. It is suitable as a filler in concrete during construction of foundations and otmostok. In high-rise buildings to use crushed granite, because it has a high level of strength. When the structure is not higher than 3 storeys, in an aggregate in concrete is the perfect gravel gravel, which is slightly different in the strength of granite rubble, but is attractive to a buyer the difference in value, which is a gravel aggregate is much lower.

Gravel fraction 20/40 is mainly used for drainage device. It also recommended the use of crushed gravel, as in the operation of the drainage system as the difference between gravel and granite rubble there, but the use of granite rubble significantly increases the cost.

Large gravel fraction 40/70 as granite and gravel, and lime is mainly used for pouring in the construction of roads.

The main characteristics of gravel are the strength (from a very poor indicator of the strength of the M 200, to high-M1400, the strongest is crushed granite), frost (from 25-100 cycles in limestone gravel to 300-400 at the rubble of granite), flakiness (grain shape, with gravel aggregate, it is rounded, with granite rubble acute-angled), as well as grain composition, the content of harmful impurities, the contents of flour and clay particles, radioactivity.

 

 

Crushed granite
 
Crushed dolomite
Crushed granite
 
Crushed dolomite
Crushed gravel
 
Rubble from the volcanic rocks
Crushed gravel
 

Rubble from the volcanic rocks

Rubble from the solid (dense) rocks
 
Crushed lime
Rubble from the solid (dense) rocks
 
Crushed lime

 

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