It is difficult to imagine the construction of any scale that can do without the use of at least one type or a crushed stone fraction. Whether it is the construction of a large industrial facility, or the construction of an individual house, this loose natural material is always in demand. Many organizations and firms throughout Russia are engaged in the sale and delivery of crushed stone to the customer, wholesale and retail to buy crushed stone with delivery to St. Petersburg will not be difficult, just use the Internet, or other sources of information. As already noted above, crushed stone is a bulk of coarse -grained material. The standards provide for its various fractions (dimensions), the smallest is considered to be the euro -shaped with dimensions of 3-8 mm, in large fractions, the sizes of grains can reach 77 mm. Larger “stones” are already non -standard sizes. Another important characteristic of crushed stone is fluidity or in other words, the degree of its plane. It is believed that this term occurs from the word “bream”, since the bream fish has a flat shape.
The composition of the main components distinguishes the following types of material: granite, limestone and gravel gravel. To obtain granite grains, by undermining the cliffs, large blocks are produced, which are placed in crushing machines. Then smaller stones are sifted into various fractions. In road construction, limestone crushed stone is widely used. Receive it with crushing sedimentary breed – limestone (calcium carbonate). This is less durable than granite material, but suitable for the construction of roads and the production of many reinforced concrete products.
Gravel crushed stone is obtained from ordinary rock. There are two types of gravel material – stabbed, obtained by crushing the breed, and gravel, consisting of rounded pebbles of river and marine origin.
