Crushed stone is a free-flowing material with grains larger than 5 mm. It is extracted by mechanical crushing of rocks, in the case of granite crushed stone - granite. In turn, granite is a solidified magmatic mass, which millions of years ago was thrown to the surface from the bowels of the planet. So if you have crushed granite - be proud, it came to you from the deepest depths of our planet.
Production is not conducted chaotically, but is governed by the provisions of GOST 8267-93, which establishes permissible methods of extraction, quality requirements and groups of fractions (grain sizes) of the finished material. Lumps of granite, from which crushed stone is made, are almost never mined by the mine method, since the quarry technology is much more profitable. It is thanks to this that this material is distinguished by a fairly affordable price.
For the production of crushed granite, not so much is needed - several powerful specialized and very loud machines, as well as crowbars, picks and a large amount of explosives. In stages, this process looks like this:
Crushing in a rock quarry, and in the case of granite, igneous rocks. Most often, the technology of drilling and blasting operations is used for this, which is the most economically profitable of all those existing today. Restrictions on the use of explosives exist only when the quarry is located in the immediate vicinity of a settlement. As a result of a directed explosion, pieces of various sizes are chipped off from the granite massif.
The next stage is loading the granite pieces onto trucks and delivering them to the factory, where they are crushed into pieces that already fit the criteria for rubble. The methods of crushing at various enterprises are very different - from vibration, to pressing and cutting, but in any case, the process is carried out by a special machine with high productivity, since manual labor is completely ineffective here - granite is a solid rock.
The detailed but mixed small pieces of granite fall into a roar - a special machine, the basis of which is constantly moving sieves of different sizes. The mass is poured into the upper sieve with the largest meshes, and gradually passes through other sieves, in each subsequent mesh they become smaller. This allows you to sort granite crushed stone by size and remove sand, earth and all other unnecessary impurities from it.
Everything, on this the production procedure can be considered complete. The rest depends exclusively on the manufacturer, who can pack his products in bags and send them for sale, fill them directly into trucks and take them to wholesale construction bases or do something else - the crushed stone is completely ready for use.