What is high alumina cement binding castable?

The main mineral of high alumina cement is calcium aluminate (CA).Therefore, refractory castable prepared by high alumina cement has the characteristics of fast hardening and high strength.Refractory aggregate and powder are generally made of clay and high alumina clinker or waste refractory brick of the same material, with the maximum service temperature of 1400℃. In general, the amount of high alumina cement is about 15%.When the temperature is high, the amount of cement should be reduced as much as possible. At present, the amount of cement in the low cement castable is reduced to about 3%, so that the content of cement and powder remains at about 30%.Refractory powder plays a role in filling aggregate pores and in solid reaction at high temperature, therefore, it is required to be as fine as possible.Used varieties should be the same as aggregate or slightly better, can not use refractory clay material instead.Refractory aggregate needs to be selected according to the different temperature of use, and should not be one-sided pursuit of high grade materials, to make the best use of everything.The maximum diameter of refractory aggregate is generally 15mm.Particle size can be appropriately reduced at higher temperature.Aggregate particle grading, usually using two-stage ingredients, can also use the same material, generally with the sand rate of 0.45~0.55 to control.Water consumption can be expressed as a mass percentage or as a water-cement ratio or as a kilogram per cubic meter.However, the general principle is that water consumption should be reduced as much as possible while ensuring the workability of refractory castable mixture.In addition, high alumina cement refractory castable can also add additives (such as water reducer, etc.) to improve construction performance and improve fire resistance.