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Refractory concrete is a special material capable of retaining its mechanical properties during prolonged exposure to high temperatures. Portland cement; slag portland cement, high-alumina, or periclase cement; water glass, and phosphate bonds are used as binders in the refractory concrete. As the filler, refractory rocks and chips of fired heat-resistant products are added to the mixture. There are 3 types of refractory concrete, based on their degree of heat resistance:
Refractory concrete is used in industrial furnaces and all other structures subjected to prolonged heating.
Refractory concrete is not as same as the refractory mortar. Mortar is used in between fire bricks, as a binder and filler. Refractory cement is used to cover the fire bricks to ensure a solid surface to face the heat. It is also used to chink the gaps between bricks. For this reason, there should be no mortar joints and as little refractory cement as possible should be used during the installation. However, each project is different from the other and the decision must be made by the refractory company. Refractory cement is also used as an ingredient in the refractory mortar.
This is a basic formula which can be used in small ovens and DIY jobs. Don’t forget that big projects such as industrial furnaces require a specific mixture for intended use. Industrial refractory cement installations should only be made by experts and professional companies.
You are going to need 3 shovels of crushed firebricks, 2 shovels of sand, 2 shovels of Portland cement, a half shovel of lime and 7 liters of water. Simply mix these ingredients together and you will create a basic refractory concrete for small-scale DIY projects.
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