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The aluminum content of calcium aluminate cement usually ranges between 40% and 80%, depending on the product type and its application. Calcium aluminate cement has characteristics such as good early strength, high refractoriness, and resistance to erosion and wear. It is mainly used in the preparation of monolithic refractories, heat-resistant concrete, leak-proof treatment in construction engineering, and reinforcement beside coal mine tunnels.
1. The Aluminum Content of Calcium Aluminate Cement
Calcium aluminate cement is a hydraulic binder made by sintering aluminum hydroxide and calcium oxide at high temperatures. Its aluminum content is much higher than that of ordinary cement. Generally, the aluminum content of calcium aluminate cement ranges from 40% to 80%, varying according to product type and application. For instance, Lafarge produces various grades of calcium aluminate cement, with aluminum content ranging from approximately 40% to 80%, to meet different customer requirements.
2. Performance Characteristics of Calcium Aluminate Cement
1. Good Early Strength: Calcium aluminate cement can provide sufficient demolding strength for castables in a short period of time through hydration behavior upon encountering water.
2. High Refractoriness: Due to the high content of alumina in calcium aluminate cement, it has excellent high-temperature performance and can withstand temperatures up to 1800 degrees or even higher.
3. Resistance to Erosion and Wear: Calcium aluminate cement has high strength and hardness, capable of resisting erosion and wear from media such as water and airflow.
3. Application Fields of Calcium Aluminate Cement
1. Refractory Materials: Calcium aluminate cement is an important binder for preparing monolithic refractories, such as ladle linings and breathable bricks. Its high-temperature stability and excellent mechanical properties enable refractory materials to be used for long durations under extreme conditions.
2. Construction Engineering: In construction engineering, calcium aluminate cement can be used for leak-proof treatment. For instance, adding an appropriate amount of gypsum can produce calcium aluminate expanding agent and gypsum expansive cement. Additionally, it is widely used in reinforcement, sealing, and blocking of coal mine tunnel sides.
3. Emergency Repairs and Construction: Calcium aluminate cement also has special uses in emergency repairs and construction. Its rapid hardening property makes it possible to complete engineering repairs in a short time.
To summarize, calcium aluminate cement plays an important role in modern industry due to its high aluminum content, excellent performance characteristics, and wide range of applications.
