Cement – one of the commonly used building materials to be used for a bunch of stone materials. Cement – this is the result of fine grinding, sintering products of one type of clay – marl or mixture of limestone and clay. The sintering process is conducted in special furnaces. The basic materials and raw materials for cement production, are: The limestone rock, clay, gypsum in its proportions; granulated slag and pyrite cinders, bauxite in as additives; coal; Lubricants – gasoline, diesel fuel, engine oil and not only; refractory bricks for lining furnaces, + use of electricity, use of services rail transport; When grinding the products of sintering additives used sand, gypsum, slag and other materials, which makes it possible to obtain cement with different properties for different purposes. Depending on the raw materials and additives cements are often divided on Portland cement and slag cement.
Among Portland, quick release and mineral supplements. Construction of concrete, which uses one or different brand of cement may acquire unique properties. Above all, this extra strong concrete, for example, runways and airfield sites to launch missiles, frost, heat and salt tolerant brand. To denote maximum strength characteristics of cement applied the concept of brand. Cement M400 indicates that the plant's laboratory at trial testing hardened cement cube with an edge of 100 mm, while crushing on the press he withstood load of not less than 400 kg/cm2. Are the most common brands of M 350 to 500. .