Sand belongs to natural materials. There are its different types which in fact are same material, but with that difference that they have various properties influencing use of sand.
The most expensive is quartz sand which it is impossible to call construction material. It is not applied in concrete production, not used as component of water mortar, do not fill up with it trench and do not level the earth. Because of the special characteristics which are available for it caused by the high content of quartz, the cost of quartz sand is quite decent therefore it is applied in other spheres of production. Quartz sand is irreplaceable at glass production, it is applied as bulk component of sanding devices which under big pressure throw out the sand stream capable to clean and also to polish solid materials.
Construction types of sand
Pit sand call the material extracted in sandpits which does not undergo special processing. However, if it goes through washing stage with the subsequent cleaning, then it is already called the alluvial sand having property with higher quality to mix up with cement.
River and career types of sand are considered as the most widespread. They are used in building sector.
Sand is quite actively applied in road making and also to charge of bottom of the constructed bases. Such very extensive sphere of use is caused by one of special characteristics of this material - open sand. In friable state this material has the porosity which is, about, forty seven percent, and in dense - only thirty seven. This property is used in various systems of engineering assignment.
Property of transformation of sand
One more specific property of sand is that this material is easily transformed from friable to dense state and vice versa. Such transformation it is possible to observe at connection it with water or at impact of vibration on it. In dense stage sand perfectly perceives heavy dynamic loads, and depreciation qualities of material give the chance to it to disseminate tension arising under the bases.
Sand for water purification, in the form of the natural filtering element in engineering constructions is used.
Sand is also included in structure of some certain types of dyes as with its help it is possible to create original decorative effect. Decorators or designers for arrangement of the most effective interior of space widely use this property. Described properties of sand have allowed it to become widespread such in human life.