Made the same brand of cement to 600 th and even the 700 mark. All cements are fast enough time hardening. Start hardening – setting – is in Within 40-50 minutes, and the end of solidification in the region of 8 13 hours depending on the brand of cement. Cement is prepared from special limestone called , earned his nickname for the color, mostly. His coat up to 0.7 m and occurs under the ground a few times at a depth of 10 m. The material is soft and therefore more easily break out. Most often the device Cement Plant have developed a mountain of limestone drift, ie part of the mountain, together with the upper clay sediments demolished down, removing the stone and grading it.
Then '' broken into pieces and formed into low piles for drying. Part of the shore spread with laying of rails, installation of brick-kilns and export material from the mountain. In the cement industry uses three main methods of cement production, which are based on various technological methods of preparing the raw material: wet, dry and combined. Wet method of production used in the production of cement from chalk, clay and additives with iron (converter sludge, ferrous product, pyrite cinders). Moisture content of clay in this case should not exceed 20%, and moisture content of chalk – 29%. Wet, this method is called, because grinding the dry mixture is produced in an aqueous medium, the output is a charge in an aqueous slurry – slurry moisture content 30 – 50%. Further, the sludge enters the kiln, diameter which reaches 7 meters, length – 200 m or more.
From the raw material during firing allocated carbon dioxide. After this process, beads – clinker, which are formed at the exit of the oven, grind into a fine powder, which is cement. Dry method production lies in the fact that the raw materials prior to grinding or in the course dried. And the raw batch comes in the form of micronized dry powder. In the dry method, which probably belongs to the future cement production to meet the gas combustion temperature serves no slag and floured powdered raw materials: limestone, clay and slag. This saves fuel, which when wet method is spent on evaporation. Combined method, as the name implies, involves the use of dry, wet method. Combined method has two varieties. The first assumes that the mixture is prepared by the wet method in the form of sludge, then it is dehydrated to a moisture content of filters 16 – 18% and sent to the kiln in the form of semi-dry mass. The second option is the opposite to the first: first using the dry method for the manufacture of raw mixture and then adding 10 -14% water, granulated, grain size 10 15 mm, and served on the firing. Our company "Building Century" is a seller of cement brands M500, M400 D0, D20 and other building materials. We sell cement (including Portland) Only the most trusted manufacturers, such as a company Eurocement. We offer not only cement but also other construction materials like: brick, fixtures, dry mixes, road slabs, floor slabs, reinforced concrete, decking, siding and not only – at the best prices, including delivery to Moscow and Moscow region.