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Aluminate cement is a hydraulic cementing material made from clinker, which primarily contains calcium aluminate, derived from bauxite and limestone as raw materials, with an alumina content of about 50% after calcination and grinding. Aluminate cement is often yellow or brown, and may also appear gray. Aluminate cement mainly contains the mineral calcium aluminate (CaO·Al2O3, abbreviated as CA) and other aluminate compounds, with a small amount of dicalcium silicate (2CaO·SiO2). Its color is mostly gray or white.
Aluminate cement has a density and bulk density similar to that of regular Portland cement. Its fineness is specified by a specific surface area ≥300m2/kg or 45μm sieve residue ≤20%. Aluminate cement is classified into four types: CA-50, CA-60, CA-70, and CA-80. The setting times and strength at various ages of each type of calcium based cement must meet the specified standards.
The CA-70 cement is a high-purity calcium aluminate cement in the aluminate cement series, also known as calcium aluminate cement due to its high purity. It is conventionally packaged in 25kg/bag.
High strength and rapid setting;
Strong resistance to reducing atmospheres and wide applicability;
High density with strong resistance to salt corrosion;
Heat-resistant, with high thermal resistance.
Making refractory preforms such as electric furnace covers, fire nozzles, and iron channels.
Used in emergency repair projects and special projects requiring early high strength.
Configuring high-purity refractory castables and other monolithic refractory materials. These can be mixed with refractory aggregates, powders, and certain additives to form refractory castables, which have high fluidity. Examples include high alumina castables, steel fiber castables, and corundum castables, suitable for various kilns and pipelines in different industries.
Calcium aluminate cement can be used alone or mixed with refractory aggregates in a certain proportion. The disadvantage of using it alone is that it is prone to cracking and has a short lifespan. When mixed with refractory aggregates, it can enhance the refractory temperature and compressive strength, leading to a longer lifespan.
Calcium aluminate cement should be checked for clumping upon opening the package. If clumping is found, it indicates moisture exposure, and its performance indices must be tested before use.
Calcium aluminate cement should be used in appropriate amounts. Once mixed with water, it should be used promptly and not left for extended periods, as it will set and become unusable once set.
After construction is completed, protect the construction surface from pressure before setting to prevent deformation.
