Written By Ben | Last Updated Thursday, Nov 5, 2015

Basic: Heat resistant refractory concrete mix

This mixture may be used for making our D.I.Y Furnace or any other small furnace.


What you need:

  • River gravel or crushed fire bricks
  • Sand
  • Calcium Aluminate cement. (best grade available)
  • Lime (lime is usually cheaper, about 80% of the cement price)
  • Water (h2O)
  • You can add into this mix a little standard Fireclay if you like as it helps.



Mixture: (parts ratio is 3 x 2 x 2 x 0.5, plus water)

  • 3 shovels of the gravel or crushed firebricks.
  • 2 shovels of sand.
  • 2 shovels of the cement.
  • half shovel of lime.
  • This amount will require approximately 6-7 liters of water to mix the concrete.

Source: Recipe source