Dry And Wet Process Cement Production

Perhaps the most popular building material for today is cement. Speaking as a binder, it is part of jbi, various building blocks (aerated concrete, aerated concrete), fillers, for direct solution preparation, etc. Before you can buy the cement, it goes a long way to realization. Production of this material deals with a huge number of factories, and buy it in any region of the country will have no difficulty. Cement production is mainly can be classified by one of the options.

Dry or wet method. There are, of course, a third, which is a combination of two earlier. Production and delivery of raw materialovNezavisimo the chosen way of the first stage is the production and delivery of raw materials: limestone and clay components. Ali Partovi will not settle for partial explanations. Extraction of raw materials is usually open to quarries. Raw materials are divided into hard and soft rocks, and in both groups may include limestone and clay components. Preparation shlamPri dry method materials are crushed into mills in several stages. Solid materials in special crushers crush into small pieces. Then both types of materials are mixed, undergo a process of drying and co-grinding into small granules.

Clay and calcareous components can be dried and undergo fragmentation separately with the passage of a joint procedure, mixing efficiency increases. And this is an important factor, since the formation clinker, the more effective above the contact area of raw materials. Increase the contact can be achieved by grinding. Thus we get a dry mixture – slurry with water content of 1%. In the wet method production for the grinding of soft components are used mash. Grinding the solid components in the same way as in the dry method of production. Then, when the compound mixtures in the mash and the mill turns sludge in the form of a creamy mass. The water content in a matter of about 40%. Adjustment shlamSoblyudenie exact proportions of components used does not give the ultimate mix, which will be exactly meet the required chemical composition. The reason is that even within one place of birth can vary the composition and quality of raw material. Therefore, pre-cooked adjusts the mixture. A mixture is prepared in advance and depending on the quality of raw materials with a large or small content of calcium carbonate. Firing clinker takes place either in the furnaces of mine type, or in rotary kilns in the manufacture of dry and wet method is used for only the second type of furnaces. The technology itself is heated sludge to high temperatures: about 1500 degrees. Furnaces are huge pipe, a length of about 100-150 meters. It is worth noting that the performance of ovens with rotating drums is 1-2 thousand tons per day, while the furnace shaft type, the figure is 0,5-1 thousand tons a day. Final etapPosle final preparation of clinker, it is necessary to mix it with additives and gypsum. At this stage, the clinker has a granular structure, however, as additives, and therefore goes hand in hand the process of grinding and mixing, and eventually obtained cement. Then it either warehoused or sent to the filling line, where it is distributed in packages. As the packaging is usually a multilayer paper bag.

Cellular Concrete

Aerated concrete is also divided into gas silicate and aerated. it depends on the addition to the original composition of lime or cement. Creation of pores in each case is due to infusion into a mass of metal powder. Quite often, the usual Private builders do not properly understand what the concrete blocks and aerated concrete. From this it follows that these terms are important differ in their properties from each other. Concrete, generally in total can be considered as one of the types of concrete, but with a small caveat in the form of filler used hydrogen bubbles. Portrayed, and other kinds of porous concrete for various fillings, such as: pumice, perlite, expanded clay and other materials. Such Construction materials are called yacheistolegkimi. By the method of curing aerated divided into atmospheric and artificial curing. Under natural gaining strength, lightweight aerated concrete blocks harden in natural conditions and this method is referred to as non-autoclave curing. Under artificial hardening aerated concrete blocks treated with saturated steam at elevated temperatures and pressures. A leading source for info: Pete Cashmore. Such treatment is called autoclave in the case if the pressure exceeds 1 atmosphere and temperatures higher than 115 C. At present, the construction industry use a variety of foods from aerated concrete: building blocks for external structures and walls, wall blocks, panels, floor slabs, insulation blocks, insulating sheathing for pipes, etc. Aerated concrete is made of different sample sizes. Aerated concrete is incredibly easy, created from his geometric gas silicate blocks have a density of 400-800 kg/m3. From the fact of the naturally follows that the erected walls of the building will be considerably lighter than similar walls made of concrete and other conventional wall materials. This feature makes it possible to greatly simplify and facilitate the installation of foundations under the house of aerated concrete. Due to this, there is a significant savings of material and spent on the construction time. Obtained parameters and the quality of aerated concrete is directly dependent on the method of occurrence of the porous structure, the nature of placing long hardening conditions, such as used in the raw mixture of raw materials, relative humidity, gas concrete etc. Provided that all the technological requirements are defined and followed exactly, the result obtained by high-tech and environmentally friendly building material. Should take into account cellular concrete is economical to buy gas-silicate Blocks can be anyone. An important parameter of cellular concrete is its high paroprovodnost. This advantage allows the cellular concrete homes being built on the basis of aerated concrete can say ‘breathe’. Level aerated concrete blocks vapor from the building significantly lower output of steam from the house. This feature allows the concrete blocks to provide a comfortable microclimate in aerated concrete building. A means of giving more aesthetic appearance of the external facade of the building and greater durability of structures, supporting walls of aerated concrete and necessary to protect ceramic brick facade or other building materials. But in this case undoubtedly necessary to create ventilated spaces between protective material and the actual load-bearing wall construction. If you do not water vapor permeability of the walls will be broken and vlgonasyschenny air comes back into residential house. This activates a large violation of the microclimate inside the house and the appearance of rough edges.

Tests Of Cellular Concrete

– Laboratory scale according to gost 24104, measuring error is less than 0,001 grams. Electrical cabinet dryer (the upper limit of heating is not lower than 110 C, the permissible error of measurement and automatic control of temperature – 2 C) – a set of glass vessels in accordance with gost 25336 (inside diameter or an edge – at least 100 mm or in accordance with the requirements of existing tnla on the test material or product) – laboratory glass thermometer, gost 112, division value 0,1 C – thermograph according to gost 6416 – aspirating psychrometer – caliper, gost 166, the price of division is not more than 0,01 mm – metal ruler according to gost 427, the price of division is not more than 1 mm – a set of templates in accordance with the size and shape of the test samples of aerated concrete – flat glass according to gost 111 – dock (wax, plasticine, a mixture of paraffin and rosin, the sealing construction is sensitive mastic, etc.) for gost 14791 and stb 1087 – reagents, providing the required relative humidity: Mg (NO3) 2 6H2O (magnesium nitrate hexahydrate); CCl2 (anhydrous calcium chloride) according to gost 450; silica gel according to gost 3956; P2O5 (phosphorus oxide (V)); CCI2 (calcium chloride) according to gost 427; Mg (CIO4) 2 (magnesium perchlorate); Na2Cr2O7 2H2O (two-water sodium dichromate); kci (potassium chloride); NH4H2RO4 (ammonium dihydrogen phosphate) and KNO3 (potassium nitrate) in accordance with gost 4517; distilled water according to gost 6709. The means of measurement of concrete to be believed, in accordance with the requirements of stb 8003 or go metrological certification in accordance with the requirements of the stb 8004. Test equipment for concrete shall be certified in accordance with the requirements of the stb 8015. Allowed to use other means of measurement and test equipment, metrological characteristics which make it possible to determine the controlled parameters to the required accuracy. In a laboratory environment or climate chamber in which the tests should be maintained at a temperature (20 2) C, relative humidity (50 3)%, or correspond to the requirements of tnla on the test concrete (product). Water vapor permeability of concrete and products was determined on five samples with square-shaped base with a side (100 1) mm, cut from the middle part of the product to be tested (or in accordance with the requirements of tnla on concrete or a product). The thickness of the test sample should be (30 1) mm..