Refractory Concrete Material Essay

1920 Words Jun 11th, 2012 8 Pages
Refractory Concrete Tutorial - Recipe and Instructions
Mixing heat resistant mortar without using a concrete mixer
Heat resistant refractory concrete
There are two ways, two types of heat resistant concretes that can be prepared. Cheaper and more expensive - stronger and weaker. The first one is a high heat refractory concrete. This type will survive in real high heat and can be used in hot-face (What is hot face? Hot face is a wall facing the main heat from a source. Internal walls, floor and arches made from firebricks inside a pizza oven is hotface. Firebricks face the heat, the hot flames from wood fire and the red hot embers.) Refractory concrete can be mixed with heat resistant cement, or, can be purchased ready in bags (the
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Ingredients in the nowadays Portland cement are:
60% to 67% CaO
17% to 25% SiO2
3% to 8% Al2O3 up to 6% Fe2O3 plus can contain also mini amount of MgO, MgSO4, Na2O, and K2O
What sort of lime is it? Hydrated Lime?
Yes it's hydrated lime, Calcium hydroxide, commonly sold in shops in bags. Calcium hydroxide is chemical compound with the chemical formula Ca(OH)2 or traditionally called; Slaked lime, pickling lime but most often by builders as theHydrated lime.

Refractory concrete dry ingredients
Put dry gravel and sand on a thin metal or plastic sheet, or on a clean concrete surface in an area you can make a bit dirty. (Be sure to clean the area and tools with water after working with cement.)
Add the cement and lime on top of the gravel and sand.
Calcium Aluminate cement and Lime will work the best as the cement in hot cooking conditions- This applies to refractory concrete as well as to heat resistant mortars.
(Lime is sometimes mixed into fire clays. This is mixed like a normal cement based mortar, but with half the cement replaced with the lime. The cement holds it together when it is drying but when the heat gets into the cement and burns it out, the lime holds it all together. Lime used in

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