Refractory cement also known as Calcium Aluminate Cement, is made from selected high-quality bauxite and lime as raw materials, which are carefully blended and mixed into raw materials in a specific proportion. These raw materials are then subjected to a high-temperature sintering process to extract aluminate as the main component, while ensuring that the content of alumina reaches the standard of about 50%, thus forming the so-called clinker.
The clinker is finely ground and finally converted into a fine powder, which is what we call refractories cement. It not only has excellent refractory properties, but is also a hydraulic cementing material that can maintain a stable structure and strength under high temperature conditions. According to the difference in refractory properties, it is divided into multiple grades such as 625, 725, and 825. Usually, the product packaging bag will clearly mark the words such as "CA-50-625#", which means that its refractoriness is not less than 1580°C, ensuring excellent performance in various high-temperature applications.
What is the difference between refractory cement and ordinary cement?
① Difference in composition
The core of refractories cement lies in "refractory". This special cement is carefully blended from high-temperature resistant materials such as alumina, calcium oxide and silicon oxide. These materials are like warriors in a small furnace, able to hold their ground in a high-temperature environment of more than 1000°C, showing excellent fire resistance, wear resistance and corrosion resistance. Although ordinary cement is also an indispensable material for construction, its composition is more inclined to daily construction needs. Mainly made of common materials such as limestone, clay and gypsum, it withstands relatively low temperatures, usually below 100°C. Despite this, it still shines in the construction field with its good bonding strength and durability.
② Comparison of physical and chemical indicators
Chemical composition: The high-temperature resistant oxides in refractory cement give it extraordinary high-temperature resistance. In contrast, the silicate component of ordinary cement is more conventional.
Compressive strength: In a high-temperature environment, the strength of it remains particularly stable, and it can show excellent performance compared to ordinary cement.
Shrinkage: Under high-temperature conditions, the shrinkage of refractories cement is much lower than that of ordinary cement, which helps to maintain the stability of the structure.
③ Distinction of application occasions
Refractory cement, like a fearless warrior, is often entrusted with important tasks and stationed in high temperature and corrosive environments such as furnaces, fireplaces, industrial kilns, and high-temperature chimneys for a long time. Its outstanding performance can effectively protect structures from damage by high temperature and corrosion. Ordinary cement, like a simple architect, silently undertakes the construction tasks of general buildings and infrastructure such as houses, bridges, roads, and concrete structures. It provides a solid foundation for these structures with its reliable bonding strength and durability. However, although refractory material cement performs well in high temperature environments, we must also make it clear that in terms of load-bearing structures, ordinary cement has better bonding strength and mechanical properties. Therefore, when choosing cement, we need to make wise decisions based on specific engineering needs and usage environments.
