Cement of M-400 (Balakleya) is 25 kg
The use of cement Cement is used for laying bricks, foundations, etc. It is used to obtain concrete, and it, in turn, to obtain reinforced concrete.
Application of cement:
The main use of cement is realized in the construction of various brick blocks. Cement is used to produce concrete, and it is used as a basis for producing reinforced concrete. Reinforced concrete is used in the construction of residential buildings and other industrial structures. Reinforced concrete is used for the construction of buildings, since it has special strength, and this is confirmed by many objects made of reinforced concrete throughout Ukraine.
Cement, concrete, reinforced concrete have found wide application in the construction sector, without which it is impossible to build any or structures. Cement occupies a leading place in the ranks of building materials. In construction practice today, the role of cement is extremely important for the release of new progressive materials.
Cement is used for the manufacture of monolithic and precast concrete, reinforced concrete, asbestos-cement products, mortars, many other materials based on cement, segments of structures, insulation, etc. The consumers of cement supplies are practically all sectors of the industry. Cement, building materials based on cement, are replacing wood and many other insulation options during construction.
Cement should be stored separately depending on the brand. Unpackaged cement is stored in closed containers, the cement in the package must be stored in dry rooms. Dampness in the warehouse is not allowed.
Cement can be stored in micro-sized containers (soft containers) made of polyethylene or propylene, the nature of this packaging should exclude moisture from entering the cement. When storing cement in an open space, it is necessary to provide a covering of film materials to protect the cement from rain, while the lower tier is folded onto a double or triple row of pallets.
During grinding, to the sintering products, dosed additions of gypsum, slag, sand and other components are made according to the technological conditions, which makes it possible to obtain cement with the most different properties, depending on consumer demand. Cement is not a natural material. Making cement is an expensive and energy-intensive process, but the result is worth it - the output is one of the most popular building materials, which is used both independently and as a component of other building materials (for example, concrete and reinforced concrete). Cement factories, as a rule, are located immediately at the place of extraction of raw materials for the production of cement.
Cement production includes two stages: the first is to obtain clinker, the second is to bring the clinker to a powdery state with the addition of gypsum or other additives. The first stage is the most expensive, it accounts for 70% of the cost of cement. And it happens as follows: the first stage is the extraction of raw materials. Development of limestone deposits is usually carried out by demolition, i.e. part of the mountain is "pulled down", thereby revealing a layer of yellowish-green limestone that is used to make cement. This layer is, as a rule, at a depth of up to 10 m (up to this depth it occurs four times), and reaches 0.7 m in thickness. Then this material is sent along a conveyor for grinding to pieces equal to 10 cm in diameter. After that, the limestone is dried, and the process of grinding and mixing it with other components goes on. Further, this raw mixture is fired. This is how clinker is obtained. The second stage also consists of several stages. These are: crushing of clinker, drying of mineral additives, crushing of gypsum stone, grinding of clinker together with gypsum and active mineral additives. However, it must be borne in mind that the raw material is not always the same, and the physical and technical characteristics (such as strength, humidity, etc.) are different for raw materials. Therefore, a specific production method was developed for each type of raw material. It also helps to ensure good uniform grind and complete mixing of the components. In the cement industry, three production methods are used, which are based on different technological methods of raw material preparation: wet, dry and combined.
Wet method of cement production is used in the manufacture of cement from chalk ( carbonate component), clay (silicate component) and iron-containing additives (converter sludge, iron product, pyrite cinders). In this case, the moisture content of the clay should not exceed 20%, and the moisture content of the chalk - 29%. This method is called wet because the raw mix is ground in an aqueous medium, at the outlet, a charge is obtained in the form of an aqueous suspension - sludge with a moisture content of 30 - 50%. Further, the sludge enters the kiln, the diameter of which reaches 7 m, and the length is 200 m or more. Carbon dioxide is released from raw materials during firing. After that, the clinker balls, which are formed at the exit from the furnace, are ground into a fine powder, which is cement.
Dry method consists in the fact that raw materials before grinding or in its process is dried. And the raw material mixture comes out in the form of finely ground dry powder.
Combined cement production method , as the name suggests, involves the use of both dry and wet methods. The combined method has two varieties. The first assumes that the raw mixture is prepared by the wet method in the form of sludge, then it is dehydrated on filters to a moisture content of 16 - 18% and sent to furnaces for firing in the form of a semi-dry mass. The second cooking option is directly opposite to the first one: first, a dry method is used to make the raw mixture, and then, adding 10 -14% water, it is granulated, the size of the granules is 10-15 mm and served for firing.
|Brand of cement||M500|