Boiling point of concrete?

Question

Curious on the heat resistant bricks in furnaces etc...Anyone knows the melting and boiling point of concrete?

Please advise

Thank you

Answer 1

limestone has some temperature where the lattice bonds break. People who make cement would know. Kilns or furnaces designed to breakdown the stone into powder.

Or

"The raw mixture is heated in a cement kiln, a slowly rotating and sloped cylinder, with temperatures increasing over the length of the cylinder up to a peak temperature of 1400-1450 °C. A complex succession of chemical reactions take place (see cement kiln) as the temperature rises. The peak temperature is regulated so that the product contains sintered but not fused lumps. Sintering consists of the melting of 25-30% of the mass of the material. The resulting liquid draws the remaining solid particles together by surface tension, and acts as a solvent for the final chemical reaction in which alite is formed."

Answer 2

Well, the heat resistant bricks in furnaces are not concrete.  They are ceramic.  Concrete contains water in the structure of the crystal which give it its strength.  Ceramic brick is made by forming bricks of damp clay and then heating them to drive the water out.  Concrete will be reduced to powder long before it boils.  Once it becomes a powder, its boiling point approximates that of molten rock, which it woul in fact be at that point.

The fire brick will melt and boil at about the same temperature, somewhere in the neighorhood of 4000F to 5000F.

Answer 3

The burning zone in a cement kiln is around 2500F. The material in the kiln melts during the final stages of calcining which is why rotary kilns are used instead of the more efficient tower, although early parts of the calcining are done in towers for modern plants. The refractory lining of the kiln has to withstand this temperature to protect the steel shell. Due to high costs of the brick liners, they are installed in zones with different temperature bricks for different temperatures. The bricks are made from naturally occurring materials.

Concrete is the product of mixing cement, aggregate and water and would not be used in temperature critical applications.

Answer 4

Those 'fire-brick' furnaces also use a special cement.

It's not concrete.