Learn which plants thrive in your Hardiness Zone with our new interactive map!

How to Make Refractory Concrete

By Contributing Writer ; Updated April 27, 2018
Refractory concrete is often used for brick pizza ovens.
ancient oven image by Dmitry Grishin from Fotolia.com

Refractory concrete is special, heat resistance concrete. It is commonly used in the manufacture of brick pizza ovens and outdoor barbecue pits. The heat-resistant qualities of refractory concrete prolongs the life of pizza ovens and barbecue pits. Making refractory concrete from scratch is no more difficult than making regular concrete from scratch. You should be able to make a small batch easily within 20 minutes.

Add three shovels full of crushed bricks to the cement mixer.

Add two shovels full of sand to the cement mixer and turn on the cement mixer to start blending the ingredients.

Add two shovels of cement to the cement mixer.

Add half a shovel of calcium hydroxide to the cement mixer.

Allow the dry ingredients to become thoroughly mixed.

Add 6 liters of water, 1 liter at a time.

Allow the concrete to mix into a molding clay-like material. If the concrete is still flaky or dry, add another 1/2 liter of water.


Things You Will Need

  • Concrete mixer
  • Shovel
  • Crushed fire bricks
  • Sand
  • Calcium Aluminate cement
  • Calcium hydroxide (Lime)
  • Water


  • Concrete is caustic. It will cause burns to the skin if it is not washed off quickly. Do not ingest, inhale or get concrete, or its dust, in mucous membranes.