At what temperature is cement made


If the building material concrete is exposed to a fire or very high temperatures, high thermal stresses occur in the material, which impair the compressive strength. The result is cracking and the material flaking off. When extinguishing with water, a so-called cold shock occurs, in which further concrete fragments are blasted off very violently.

The heat resistance of concrete can be increased by a mixture of generally heat and heat resistant, refractory, porous or dense aggregates. As a rule, blast furnace slag, blast furnace slag, tabular alumina or binders are used with which concrete can withstand temperatures of 500 ° C to 2,000 ° C. If this is the case, one speaks of Refractory concrete. It is one of the special concretes and can be used for load-bearing and non-load-bearing components and systems as well as for precast or reinforced concrete structures. Prefabricated parts made of refractory concrete are usually preheated in order to drive out most of the water. Areas of application are the construction of nuclear reactors, components for furnaces in industrial plants, chimneys, non-flammable containers, insulation and load-bearing components.

Like other concrete-like materials, refractory concrete can be classified according to various aspects, including the type of cement bond, its chemical-mineralogical character or the type of granulate components. A classification according to the application limit temperature is also possible. Thereafter, refractory concrete applies at temperatures of:

  • 350 to 600 ° C as heat resistant
  • 600 to 1,100 ° C as heat-resistant
  • 1,100 to 1,500 ° C as refractory
  • over 1,500 ° C as highly refractory

Expertise on the subject


Concretes with special properties

For structures with special requirements, concretes with special properties are used that can withstand the stresses ...

Fire protection

Fire behavior according to building material classes

Building materials are divided into building material classes to determine their properties required by building law. At national level ...

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