High alumina cement is obtained by fusing or sintering a mixture, in suitable proportions, of alumina and calcareous materials and grinding the resultant product to a fine powder.
The raw materials used for the manufacture of high alumina cement are limestone and bauxite.
High alumina cement, sometimes called calcium aluminate cement or aluminous cement, is very different in its composition and in some properties from portland cement, but concreting techniques are similar.
The converted form of HAC may show a reduction in strength and become more susceptible to certain forms of chemical attack.
It is known that the initial product of hydration of high-alumina cement at low temperatures, often labeled “CAH10,” contains both crystalline and amorphous portions.