Heat-resistant concrete: the types of material temperature.

14-05-2018

Building

Currently, there are a huge number of different types of concrete, which have their own area of application and additional properties, specially selected for specific needs. However, there are situations when this material is exposed to various factors in the form of high temperature, which are not peculiar to it. Therefore, the question of how to make heat-resistant concrete with their own hands is very interesting for modern masters.

Amateur photo of the furnace where similar material is used.

Types of material temperature

For a start it is worth mentioning that there are many varieties of such materials. All of them have their own technical characteristics, the most important of which are temperature parameters. Therefore, it is necessary to understand their composition and method of manufacture.

There are already ready-made brands of such material that can be used immediately after dilution with water.

Temperature range up to 800 degrees

First of all, it is necessary to say that the composition of heat-resistant concrete allows using this material at high temperatures without changing its basic properties.

You can get different brands of this solution, depending on the proportion.

Typically, in the manufacture of such a composition, it is immediately cast into forms to obtain a specific product, and surface casting is used very rarely

The main role in such compositions is played by a special additive.. It can be purchased in specialized stores or in the markets of building materials. However, it should immediately be said that an additive is needed for making concrete, and not a composition for paint or other substances.
It is also necessary to use other binding agents.. Simply put, for one part of Portland cement add the same amount of slag Portland cement. In this case, both of these substances are considered as one unit of measurement in the selection of proportions.

In domestic conditions, such formulations are prepared in small quantities, since bulk products are much easier to purchase ready-made

Also the composition of heat-resistant concrete is changed in relation to fillers. Instead of the usual rubble, brick fights, blast furnace slags or rocks are used. Claydite, pumice, perlite, diabase, andesite and diorite are excellent for this role.
Instead of sand, it is better to put electrocorundum into such a solution, but for these temperature conditions it is not necessary.

Tip! It is very important to follow the instructions that come with the supplement. They may differ from each other depending on the brand.

Table of approximate compositions of heat-resistant concretes

Temperature range up to 1700 degrees

These types of material must retain their properties at very high temperatures, which means that their composition must be approached very carefully. That is why corundum is used as sand for them, which is desirable to additionally be cleaned from various impurities.

The use of such types of concrete in everyday life is usually limited to the manufacture of fireplaces, stoves or peculiar decorative elements.

Also in such a concrete you need to add other types of additives that can withstand high temperatures. Their price may seem too high, but they fully justify all the costs.

Professionals recommend using magnesite, chromite, burnt kaolin or fireclay bricks as a filler. Moreover, if heat-resistant concrete is made by hand, it is better to purchase this material from trusted people.

It is important to mention that some masters recommend using other materials as a binder instead of cement. They may differ in their composition and even be liquid, but they must be selected individually.

Tip! If the scope of such solutions requires a strictly defined quality, then it is best to order them from the manufacturer, who has the appropriate certificate for his product and does not violate the technological processes during manufacture.

Some types of such materials are used in foundry.

Application area

It is important to mention that heat-resistant concrete can have a lot of different brands and have different densities. This is the main criterion in determining its scope.

These materials found particular use in the atomic industry during the creation of power units

Thermal insulation material

In this category there are compositions that resemble foam block or gas block according to their characteristics. In fact, they are them, but only with the inclusion of a special additive and the correct selection of components. Also it is possible to carry keramsit concrete products to them.

Such grades of concrete have a certain number of cycles of use and sometimes it is much more practical to use bricks with the same characteristics.

Constructions of this material are used as a heater, which must withstand high temperatures, not allowing air to cool. At the same time, they are often located inside work areas and are subject to sharp drops.

Similar compositions are characterized as cellular and lightweight concrete. However, they have a certain thermal conductivity and resistance to intense heat.

Tip! It is important to remember that forcibly cool such materials is not worth it. They may crack as a result.

Samples of such mixtures are tested for strength, and to be sure, they are carried out in several cycles.

Construction materials

Usually, the installation manual advises the use of similar brands of concrete to create supports, floor slabs or other building elements that are exposed to heat during operation. However, it is worth noting that reinforcement with such types of concrete is not worth it. The fact is that when heated, the metal expands and can destroy the entire product.

Do not confuse concrete products for kilns with ceramic, because they have different manufacturing process and properties

Conclusion

After reading the video in this article, you can examine in detail these types of concrete and their area of application. Also, based on the text presented above, it is necessary to conclude that this material can be produced independently, but for responsible sites it is better to use the products of proven manufacturers.