What is refractory concrete made of and where is it used?

First, let's deal with the word refractoriness. According to the technical dictionary refractory is a material which under the influence of temperature not below 1580 degrees maintains its originally created state without visible destruction.

According to the refractoriness are also divided into refractory it is from 1580 degrees to 1770 C degrees, and the highly fire-resistant from 1700 degrees to 2000 C, and especially highly fire-resistant from 2000 degrees C

Concrete is an artificial masonry material consisting of a binder – cement, fillers and water, which hardens to a certain strength under the influence of chemical reactions.

Concretes are also divided into light and heavy. Chemical and mineral composition and manufacturing methods of refractory concrete must comply with the intended use.

The binder used for refractory concrete is:

Alumina cement of grades GTs-60, GTs-50, GTs-40, cements alumina and high alumina.

Portland cement. The main characteristic of Portland cement is determined by the strength class B 32.5 (M400) B42.5 (M500) B52.5 (M600)

Concrete on liquid glass, i.e. on silicate glue – an aqueous alkaline solution of sodium or potassium silicates

As fillers are used chromite, fire clay bricks, diabase, basalt, andesite, magnesite bricks, cement, pumice, granulated blast furnace slag, loess.

Additives are also used to stabilize the concrete mixture during hardening – it is phosphate flour, sodium silica. And water. In this case, the proportions of the composition are adjusted depending on the fillers used.

The greatest refractoriness has a concrete on Portland cement, which withstands and does not collapse to a temperature of 1700 degrees when used as an aggregate chromite.

Refractory concrete (heat-resistant) is used as lining of thermal units.