High alumina cement (HAC) is a special cement, manufactured by mixing of bauxite ( aluminium ore) and lime at a certain temperature. This cement is also known as calcium aluminium cement (CAC).
Chemical Composition Of High Alumina Cements [IS:6452-1989]:
Alumina (Al2O3) – 39%
Lime (CaO) – 38%
Ferric Oxide (Fe2O3) – 10%
Silica (SiO2) – 6%
Ferrous Oxide (FeO) – 4%
Applications Of High Alumina Cement:
- This cement is very suitable for under sea applications and sewer infrastructures.
- It can be used in cold area where rapid strength development is required.
- HAC is also used in refractory concretes where it requires more strength at very high temperature.
Advantages Of High Alumina Cement:
- High alumina cement is very reactive and has very high compressive strength.
- It is more workable than ordinary portland cement.
- The initial setting time of HAC is about to 3.5-4 hours, and the final setting time is about to 5 hours.
- It is extremely resistant to chemical attack.
- It induces more heat during the setting time, so it can not be affected by frost.
- It is fire resistant.
Disadvantages Of HAC:
- The manufacturing cost of HAC is very high.
- It loses relative strength in humid condition and high temperature.
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