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High Alumina Cement, also known as calcium aluminate cement, is a hydraulic binding material, denoted as CA, made by finely grinding clinker composed mainly of monocalcium aluminate and dicalcium aluminate, which are produced by melting or sintering bauxite and limestone as raw materials. According to needs, suitable amounts of α-Al2O3 powder can also be added when grinding the cement with an Al2O3 content greater than 68%. In the process of producing its clinker, the main methods are the melting method and rotary kiln sintering method. Calcium aluminate cement is known for its properties of fast setting, early strength, resistance to acidic and saline media corrosion, ability to harden at low temperatures, and high-temperature resistance.
The suitable addition amount of high alumina cement varies depending on the application scenarios and performance requirements. Generally speaking, in refractory castables, the addition amount of high alumina cement is usually between 6% and 15%. The specific amount needs to be adjusted according to actual conditions to ensure the castables achieve the best performance.
High alumina cement is a key ingredient in refractory castables. It not only acts as a binder but also plays a crucial role in enhancing the strength and other properties of the castables. Therefore, it is crucial to control the addition amount of high alumina cement when preparing refractory castables.
Performance Requirements of Castables
High alumina cement addition should be determined based on the performance requirements of the castables. Generally, for castables requiring higher room temperature strength and refractoriness, the amount of high alumina cement can be appropriately increased. However, too high a cement content may lead to an increase in liquid phase at high temperatures, reducing the high-temperature performance of the castables. Therefore, while ensuring room temperature strength, the cement content should be minimized to improve the high-temperature performance of refractory castables.
Experimental Data and Professional Recommendations
Based on experimental results and professional recommendations, the suitable addition amount of high alumina cement in refractory castables is usually between 6% and 15%. The specific amount also needs to be comprehensively considered based on the ratio of aggregates and powders, water content, and construction conditions. In actual applications, adjustments can be made according to specific conditions to achieve the best castable performance.
Strength and Refractoriness
Appropriately increasing the high alumina cement content can enhance the room temperature strength and refractoriness of the castables. However, when the cement content is too high, it may lead to an increase in liquid phase at high temperatures, thereby reducing the refractoriness and load softening temperature. Therefore, when preparing refractory castables, the optimal balance point of cement content should be sought.
Construction Performance
High alumina cement content also affects the construction performance of castables. The amount of water added is closely related to the cement content; too much cement may make the castables too dense, making construction difficult, while too little cement may prevent the castables from forming a dense accumulation, affecting the usage effect. Therefore, during construction, the amount of water and cement should be strictly controlled to ensure the castables have good construction performance and service life.
