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Refractory cement, as a specialized refractory material that draws significant attention in the industry, is also scientifically known as aluminate cement. The manufacturing process of this cement is extremely meticulous. It carefully selects high-quality bauxite and lime as raw materials, which are intricately formulated and mixed into raw meal at a specified ratio. These raw meals are then subjected to high-temperature sintering, from which aluminate, the primary ingredient, is extracted. It ensures that the alumina content reaches around 50%, thus forming what is known as clinker.
The clinker is finely ground, eventually turning into a fine powder that we call aluminate cement. It not only possesses excellent refractory properties but also acts as a hydraulic cementing material that can maintain stable structure and strength in high-temperature environments. Based on differing refractory properties, aluminate cement is classified into various grades such as 625, 725, 825, etc. Typically, product packaging will clearly indicate labels like "CA-50-625#", signifying a refractory temperature that is not less than 1580°C, ensuring excellent performance in various high-temperature applications.
Based on differences in composition and characteristics, aluminate cement can be further divided into several categories, such as low-calcium aluminate refractory cement, calcium-magnesium aluminate cement, and dolomite refractory cement. These various types of refractory cement have extensive applications in their respective fields, providing solid material assurance for engineering projects in high-temperature environments.
Fineness of Aluminate Cement
Fineness, in simple terms, is the degree of coarseness or fineness of cement particles. The finer the particles, the larger their specific surface area, which means the cement can react more fully with water. This comprehensive hydration reaction not only speeds up the reaction but also ensures that both the early and later strength of the cement are maintained at high levels. According to national standards, the specific surface area of qualified aluminate cement should be at least 300 m²/kg, which is an important indicator to ensure its performance.
Setting Time of Aluminate Cement
Setting time is crucial for the construction process. The initial setting time, which is when the cement begins to lose its plasticity, should not be too short to ensure that construction workers have enough time for mixing, transportation, and molding operations. The final setting time, which is when the cement completely loses its plasticity and begins to gain strength, should not be too long to ensure that the necessary hardness is reached quickly after construction. According to regulations, the initial setting time of aluminate cement should not be earlier than 45 minutes, and the final setting time should not be later than 390 minutes. These time settings are intended to ensure smooth construction and full performance of the cement.
Volume Stability of Aluminate Cement
This is an important indicator to measure whether the volume of the cement paste changes uniformly during the setting and hardening process. If the volume change of the cement is uneven, i. e., the volume stability is poor, it is easily prone to warping, cracking, and other issues during use. This not only seriously affects the quality of the project but may even cause safety accidents. Therefore, volume stability is an aspect that cannot be ignored when evaluating the performance of aluminate cement.
