Construction sand — one of the main materials used in different areas of construction. This sedimentary material the size of the grains up to 5 mm is composed of small particles of minerals and rocks that had been destroyed by a natural. Composition of sand is, depending on the species from which it was formed.
Building sand is used in the production of construction materials — bricks, concrete, concrete products. It is also used for laying roads and railway cars, for the back filling in housing, basic landscaping work areas. Sand is a major component for glass production. This material has excellent ability to pass water, while holding various impurities contained in it, because it is used in filter systems, drainage and sewage treatment plants. High-quality sand, coupled with different dyes is also a component of various coatings that are used for decorating the premises.
On the origin of sand for construction is divided into two categories: the river and career.
Material, mined in open pits, is a small mixture of mineral grains having a size of from 0.15 to 5 mm. Extraction is done in an open pit methods using languid excavators. Modulo size sand for construction in most cases, the fine has high content of clay and silt materials, has a permeability of up to 3 meters.
A high-quality view of quarry sand, is a career alluvial mining of which is carried out by the method of washing hydromechanized ordinary material. It has more supreme permeability coefficient and the content of particles outside it becomes even lower.
River sand is extracted from the bottom of rivers. It is more "unstained" than rigid, has virtually no external impurities — organic substances and clay, which makes the technical properties more highest. Modulo is a medium-size. Coefficient of permeability of the material itself — up to 5 meters per day.
Because the river sand is a high quality, its price, respectively, higher than the price of career.
According to experts at the quality of shared sand building into three classes: the special, I and Class II class. Special used for the production of concrete and concrete products of the highest strength (above 40 MPa) which are put forward excessive demands on water resistance (up to W-8), frost (up to F300) and resistance to impact Nekhoroshikh brutal environments. Lower class sand, the lower the requirements for products manufactured from it. For Class I, they are: strength of 30 MPa, water resistance — up to W-4, frost resistance — up to F200. The class II vіdvigayutsya only requirements on strength — 20 MPa. Price sand overvalued properties, on average, 30% higher than the price of the material relating to the class II.