- Time:Aug 22, 2023
The construction temperature of refractory castables usually depends on the nature of the material, construction requirements and specific application environment. The following are the optimum temperature ranges for the construction of refractory castables in some common cases:
1. Conventional refractory castables: For most conventional refractory castables (such as high alumina castables, silicate castables, etc.), the optimum construction temperature range is usually between 5°C and 35°C. Temperatures in this range help ensure the flow and workability of the castable while allowing sufficient time for application and full cure.
2. Low-cement castables: Low-cement castables generally contain less cementitious materials and rely primarily on other fine powders to provide structural strength. The optimal temperature range of this type of refractory castable is generally lower than that of conventional castables during construction, usually between 0°C and 25°C.
3. High temperature castables: Some special application scenarios may require the construction of refractory castables under high temperature conditions. For example, refractory castables for kiln linings or high temperature industrial equipment. In this case, the application temperature can exceed 1000°C to ensure that the material has proper fluidity and curing ability in high temperature environment.
Regardless of the temperature range in which the construction is carried out, the following items need to be paid attention to:
1. Avoid extreme temperature conditions: Too cold or too hot environments should be avoided during construction, because extreme temperatures will affect the fluidity, setting time and strength development of the castable.
2. Consider speed of application: When applying in cold environments, it may be necessary to increase the speed of application to avoid premature freezing or solidification of the material. When applying in high temperature environments, it may be necessary to complete the pouring and curing process more quickly to avoid loss of fluidity or premature curing of the material.
3. Control material temperature: It is necessary to control the temperature of the refractory castable itself to avoid excessive heating or cooling before or during construction. This involves the method of storage and handling of refractory castables.
The optimum construction temperature depends on the specific refractory castable and application environment requirements. It is recommended to refer to the technical information provided by the supplier and consult professionals before selecting and using refractory castables to ensure construction within the most suitable temperature range.
