Cement - one of the main construction materials used in this area since ancient times.The cement composition includes a number of inorganic substances which in contact with water to form a so-called solution.With a range of specific physical qualities, by drying the solution hardens.
produce cement in several ways, but most of them are two basic: dry and wet.Its manufacturing - quite expensive and energy-intensive process.So-called sludge initially loaded into a special furnace, after which sintering occurs clinker.During manufacturing furnace it is continuously rotated, whereby the clinker therein uniformly mixed.This allows you to make the mixture more uniform and evenly melted.
The composition of cement included iron oxide.He has a very big impact on the overall quality of the resulting mixture of cement.The cement of the highest quality - with an iron oxide content of about 10%.With such a ratio of oxides have the most beneficial effect on the formation of minerals.But all necessary measure, however with increasing amounts of iron oxide in the cement composition decreases and its overall quality.
maximum allowable considered 25% of iron oxide.As is known, cement is also used for the construction or forming refractory structures and designs.In this case, the presence of iron oxides is unacceptable.In addition, the amount of iron directly affects the color of cement: the brighter it is, the lower the percentage of additives.Gray cement, in contrast, is composed of the highest content of iron oxides.
If you continue to disassemble the chemical composition of the cement, it can be found in it, and alumina.The greatest amount of alumina contained in the cement composition, it imparts heat resistance properties.Qualitatively, the cement content of the material is about 60%.
addition to these oxides, in the cement composition comprises oxides of calcium, silicon, magnesium.Cement manufacturers are working actively, so that their products did not contain the chromium oxide which is an active metal and comes into undesired chemical reactions.
Depending on the composition of the cement, it is divided into types with different physical properties: gipsoshlakovy, fast setting, ash, alumina, gypsum-alumina and waterproof.
The composition of cement to improve its qualities add various active mineral supplements.They are artificial or natural origin.Cement additives giving it different properties: it improves workability and increase fluidity, improve extensibility, reduce shrinkage, flexibility and density change.Furthermore, the addition of these agents contributes durability and strength of mortars.
cement additives are used not only to improve some physical properties of the individual, but also for changes, for example color.For these purposes may be a conventional dye.
