High alumina cement or HAC is a unique concrete, fabricated by blending bauxite (aluminum ore) and lime at a specific temperature. This Cement is also known as Calcium Aluminum Cement (CAC).
It is determined that the complete alumina substance should not be less than 32% and the proportion by weight of alumina to the lime should be somewhere in the range of 0.85 and 1.30.
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Bief History
Because High alumina cement is not used in the modern industry, let us discuss some history about it.
High Alumina Cement was first evolved in the United Kingdom in 1925 by a concrete maker by the name of Lafarge. As it was viewed as impervious to chemical attacks it was fundamentally utilized for marine development. Its fame rose when the properties of this concrete, for example, fast strength gain and simple to make were found out and generally utilized for precast cementing.
Composition of High Alumina Cement
Alumina (Al2O3) – 40%
Lime (CaO) – 37%
Ferric Oxide (Fe2O3) – 11%
Silica (SiO2) – 6%
Ferrous Oxide (FeO) – 3%
Uses of High Alumina Cement
- It is used for structure near the sea
- It can be used where immediate strength is required
Advantages of High Alumina Cement
- It gained rapid and high strength
- HAC is highly workable cement
- It provides resistivity to chemical attack