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Low cement castable refers to the castable with low cement content.Refractory cement castable cement dosage is generally 15%~20%, low cement castable cement dosage is about 5%, some even reduced to 1%~2%.The purpose of reducing cement content is to improve the fire resistance of castable.

It relies on the addition of several special materials to obtain good properties: first, pure calcium aluminate cement, due to the high content of the effective mineral CaO·Al2O3, can be mixed with less to obtain the required strength.The second silica fume is glass microbeads with an average particle size of 0.5 m and a SiO2 content of 93%~98%.After adding silica fume, the castable has good fluidity, low water requirement for forming and low sintering temperature, which improves the performance after heat treatment.Third, alumina powder, it is easy to participate in the reaction, improve the fire resistance of the material.Fourth, water reducer, it can be adsorbed on the surface of powder, and then generate electrostatic repulsion dispersed powder, so as to further play the role of micro powder.