High alumina cement is the same as rapid hardening cement, which attains ultimate strength in a short period.
Unlike Ordinary Portland cement, It contains calcium aluminates instead of calcium silicates. HAC is manufactured from chalk or limestone and bauxite.
It contains 35% of Alumina and a balance of lime components. HAC seems to be the colour of chocolate.
Bauxite, lime, or chalk are used as main ingredients for HAC, which will be grounded as small particles. Then it will be allowed to heat up to 1600。C to its melting point, then allowed to cool down to form the HAC.
Alumina | Al2O3 | 37 – 41 % |
Lime | CaO | 36 – 40 % |
Iron Oxide | Fe2O3 | 9 – 10 % |
Silica | SiO2 | 3 – 8 % |
Titanium | TiO2 | 1.5 – 2 % |
Insoluble Material | – | 1% |
Magnesium | MgO | 1% |
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