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Portland cement refractory concrete is prepared with ordinary Portland cement, slag Portland cement, and Portland heat-resistant cement as binding agents, and refractory aggregates and powders. The maximum operating temperature is 1200℃ or 1200℃ The following medium and low temperature refractory concrete. It has the advantages of easily available materials and low cost and can be used to cast integral load-bearing and heat-resistant structures and kiln linings, especially in projects such as foundations and floors of thermal equipment, flues, chimney linings, and thermal storage tanks. More.
Ordinary concrete prepared with Portland cement is not fire-resistant and is prone to damage or serious loss of strength when exposed to heat for a long time. Based on overcoming this defect, Portland cement refractory concrete was gradually formed.
The preparation of Portland cement refractory concrete is generally divided into two aspects:
1. Add specific powder to Portland cement
In Portland cement refractory concrete, specific powder is added, its main functions are: reducing the shrinkage of cement stone; binding free calcium oxide; and stabilizing dicalcium silicate.
2. Use appropriate aggregates
From the analysis of the causes of thermal damage to ordinary concrete, it can be seen that the aggregate used to prepare refractory concrete should not be made of quartzite composed of crystallized quartz or anisotropic granite containing crystallized quartz, but should be made of Homogeneous materials that are relatively stable in volume at high temperatures and contain little or no crystalline quartz, such as refractory clinker, refractory clay brick fragments, red brick fragments, blast furnace slag and other igneous rocks. At the same time, the expansion value of the aggregate should be as small as possible to reduce the difference in the shrinkage of the cement stone.
As the aggregate of refractory concrete, it should also have the characteristics of not softening and not decomposing at high temperatures. Some aggregates decompose at room temperature or after being exposed to high temperatures, so you should be particularly careful when using them. If the maximum service temperature of refractory concrete exceeds the minimum temperature at which such natural rocks begin to decompose, they are not allowed to be used as refractory aggregates.
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