Today, for the manufacture of concrete structures and products, as well as construction of roads, is widely used rubble. Crushed rock – inorganic granular material, with grains of size more than five millimeters, it turns out through crushing of rocks, boulders and gravel. Properties of rubble. The quality of ballast is determined by its properties, it is – the faction, flakiness, morozstoykost, durability, radioactivity. Now a little more about each of their properties. Flakiness – a parameter plane rubble, flakiness when describing the qualities of rubble, one of the most important characteristics. Indeed, the use of crushed stone cubic form, gives a very tight ramming. Use of the rubble form the most appropriate and economical.
Frost resistance – is characterized by the number of cycles of thawing and freezing. In the construction of rubble used to mark frost from F300. The cycles frost rubble marked as follows: F15, F25, F50, F100, F150, F200, F300, F400. Durability – characterize the boundaries of the original strength of rock under compression and crushing. Depending on the type of gravel is divided into the following groups: very low strength of M200, weak strength of M600-300, the average strength of M800-600 M1200-800 rugged and durable M1400-1200. The radioactivity of rubble – with this performance should begin discussion of the quality of construction rubble. For almost all types of construction work can be used only rubble of the first class of radioactivity (less than 370Bk/kg).
A road construction, you can use crushed stone of the second class (more 370Bk/kg). Varieties of rubble. For various construction works used different types of gravel. Granite rubble – consists of a granular structure of the rock – granite. It consists of: a well-formed crystals of mica, quartz, feldspar, it has red, pink or blue color. Monolithic granite rock exploded, and then crushed in a car, and the resulting rubble is sifted into fractions. Gravel crushed stone – is obtained by sieving or crushing of rock quarrying natural stone cliffs. Prices Crushed gravel is lower than granite, and generally have a low radioactive background, but here it is inferior in strength granite. Gravel gravel used for concrete, road construction, for foundation work in production of concrete products. There are two types of gravel ballast is crushed gravel and gravel, it is usually a sea or river of origin. Limestone gravel consists mainly of calcite, occurs from crushing limestone. It is One of the main gravel road construction and manufacture of concrete products. Slag ballast is obtained by special processing of liquid fire-slag melts or by crushing dump slag. The cost of such products at 20-30% less than traditional rubble. There is a secondary gravel – it is obtained by crushing debris: asphalt, bricks and concrete. Main advantage is cheap, and although in many ways inferior to natural secondary gravel, it is still widely used in construction. In any case, the rubble – one of the essential building materials.