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Admixtures are added to a
concrete mix either before or during its mixing to modify the
properties of concrete like setting time, curing, temperature,
colour or workability.
The use of Admixtures help to achieve the
following objectives:
1. To reduce the cost of concrete
construction.
2. To maintain the quality of concrete during
different stages of concreting like mixing, transporting, placing
and curing.
Admixtures can be classified into the
following five major categories:
- Retarding admixtures
- Accelerating admixtures
- Super plasticizers
- Water reducing admixtures
- Air-entraining admixtures
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Some other types could be regarded as:
- Corrosion inhibitors
- Shrinkage reducing
- Colouring admixtures
- Permeability reducers
- Damp-proofing admixtures
- Hydration control admixtures
- Alkali-silica reactivity inhibitors
Concrete admixtures can be either of the
following types:
Mineral admixture
Chemical admixture
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