Rubble – this material is obtained as a consequence of crushing rock. Get his career by the explosion of rock, which is then crushed into rubble. The most widely used and is a granite rubble. Get crushed and the crushing of boulders and gravel. Fraction of rubble – the average size of the grain.
According to these characteristics, the grain size is the separation of gravel into fractions by sieving. The smaller faction of rubble per unit volume – such as cubic meters of rubble more fines will be harder than cubic meters large, respectively, a ton of rubble various factions will have a different volume, it is very important when you deliver rubble. Density of gravel is measured – the average state standard of 2 to 3 g/cm3 for. Secondary gravel (the product of crushing various materials from brick to concrete and asphalt) has a higher density. Granite rubble. For concrete-construction works, the manufacture of concrete products, landscaping, installation of drainage, leveling monolithic fillings.
Crushed granite is obtained by crushing a granite rock. In the pits when mining granite, first with blocks separated by explosion rocks and then crushed in a crushing machine, and finally sieved and separated into fractions rubble. Fraction of rubble, less is more expensive (more than the cost of fragmentation). Frost resistance of the granitic Drizzle the number of cycles of freezing and thawing, at which the material loses its properties. Frost resistance of gravel is permitted to estimate the number of cycles of a saturated solution of sodium sulfate, followed by drying. Crushed granite also divided into grades by frost. Crushed gravel .Graviyny obtained by sieving rock quarry, and also in the process of crushing natural rock cliffs. Gravel crushed granite inferior in strength, but has less radioactivity and price. Crushed gravel used for foundation works, concrete production, in the manufacture of concrete products, while laying and road building. Limestone. Calcareous (limestone or dolomite) is the main rubble of all natural stone materials used in road construction. It is used both independently and with other materials, as well as a component in asphalt, cement and concrete. Crushed lime for the repair and maintenance of highways is a major component, and protects the wear layer, which provides the desired surface roughness pavement. It turns crushed limestone (dolomite or limestone) from limestone by crushing, followed by chemical treatment of the material obtained. Since the material is fragile limestone, crushed stone derived from it has the brand strength is not high (400 to 800)