铝酸钙水泥作为耐火浇注料结合剂的研究进展

耐火浇注料具有无需成型、容易施工、易于修补等优点，在高温工业领域得到广泛使用。铝酸钙水泥(calcium aluminate cement, CAC)因具有快速硬化、早期强度高、优异的抗侵蚀性能和抗磨损性能等优点，被广泛应用于浇注料中。对铝酸钙水泥的水化机理进行着重分析，对比分析多种结合剂的优缺点。从养护温度、微粉和外加剂3个方面分析铝酸钙水泥水化反应的影响因素。养护温度越高，CAC的水化程度增加，水化产物的分布越均匀。微粉和外加剂的添加可以提高水化速率并降低孔隙率。同时介绍铝酸钙水泥结合浇注料的改性方法，分析碳物质、分散剂对其施工性能和力学性能的积极作用。最后基于铝酸钙水泥结合浇注料的改性以及所面临的问题做出展望，指出探索合适的分散剂、碳物质、外加剂来提高铝酸钙水泥的水化速率、增强其结合浇注料的机械性能是今后研究的重点。

Research progress and prospect of calcium aluminate cement as binder for refractory castable

Refractory castables are widely used in high-temperature industrial fields because of their advantages of no molding, easy construction, and easy repair. Calcium aluminate cement (CAC) is widely used in castables due to its advantages of rapid hardening, high early strength, excellent erosion resistance and wear resistance. In this review, the hydration mechanism of calcium aluminate cements is highlighted, and the advantages and disadvantages of various binding agents are summarized. The influencing factors of the hydration reaction of calcium aluminate cement are analyzed from three aspects: curing temperature, micropowder and admixture. The influencing factors of its hydration reaction are explained. The higher the curing temperature, the higher the degree of hydration of CAC and the more uniform the distribution of hydration products. The addition of micropowders and admixtures can increase the rate of hydration and reduce porosity. At the same time, the modification method of calcium aluminate cement combined with castable is introduced, and the positive effect of carbon material and dispersant on its construction performance and mechanical performance are analyzed. Finally, based on the modification of calcium aluminate cement combined castables and the problems faced, the outlook is made, and it is pointed out that exploring suitable dispersants, carbon materials and admixtures to improve the hydration rate of calcium aluminate cement and enhance the mechanical properties of its combined castables is the focus of future research.