The main mineral of high alumina cement as calcium aluminate (CA), the hydration speed, and precipitation of calcium hydroxide. Therefore, high alumina cement prepared with the characteristics of the fire resistance of the fast hardening and high strength. Fireclay and high
alumina clinker or with the same material waste
refractory bricks, which is normally used in refractory aggregate and powder material, the maximum temperature for 1400 DEG C. Under normal circumstances, high alumina cement dosage is about 15%. When the temperature is high, it should be used to reduce the amount of cement, at present, the amount of cement in low cement pouring material is reduced to about 3%, so that the content of cement and powder is kept at about 30%. The refractory powder plays a role of filling in the pores of the aggregate and participating in the solid phase reaction at high temperature. Therefore, it is required to be as thin as possible. The varieties shall be in the same or slightly better aggregate, and shall not be used in place of the refractory mortar
materials. The
refractory need to be chosen according to the different service temperature, should not one-sided pursuit of high grade material, to turn material resources to good account. The maximum particle size of the refractory aggregate is generally 15mm. When the temperature is high, the particle size can be reduced. The particle size distribution of aggregate, usually used in the two grade ingredients, can also be used in the same material, the sand rate is generally 0.45~0.55 to control. Water quality can be expressed as a percentage of the amount of water, and it can be expressed as the amount of water to be used to be used to say that the amount of water in a water cement ratio or the. But the general principle is: in the case of the fire resistance of the mixture and the workability, should try to reduce the use of water. In addition, high alumina cement
refractory pouring material can also be mixed with additives (such as water reducer, etc.) in order to improve the construction performance and improve the fire resistance.
