Introduction to Refractory Concretes

Depending on the additives used, refractory concretes acquire the necessary properties: fire resistance, porosity, heat resistance, maximum application temperature, etc.

This paper presents an experimental study on the performance of shielding refractory concretes containing new types of cements for use in the radiation protection technology.

This article gives a brief introduction to refractory concretes.

Studies have shown that under normal curing conditions at one-day age, refractory concretes based on an iron phosphate binder acquire strength sufficient for stripping, transportation, and installation of structures.

A fundamental difference between the grain size composition of cement-free refractory concretes (CFRC) from low- and ultra-low-cement concretes is presence within their composition of up to 2 – 3 % nanoparticles (<0.

The performance of exposure tests on heat and scale resistant steels and refractory concretes in flue gases from miscanthus as well as adapted K 2 CO 3 crucible tests allow first conclusions to be drawn about the resistance of the materials investigated in flue gases from biogenic fuels.

Among modern refractory concretes (MRC), those with low cement content (LCC) where CAC = 4-6wt%, are widely commercialized, considering that their properties approximate those of burned bricks of the same class.

The general nature of the dependence of the technological and service characteristics of refractory concretes with an average cement content, as well as low-cement (LCRC), ultra-low cement (ULCRC) and cementless (CLRC), on the content of CaO (or НАC) in them is analyzed.

Refractory concretes with the usual cement content (about 20%) present, besides their well-known advantages, several important disadvantages which make such concretes unfit for certain applications.