These are the members of minerals used in cement.The cement motor and cement concrete these are minerals used,the used cement concrete that in order to improve their supply properties.
The admixtures are materials used other than three basic ingredients of cement concrete,these ingredients of cement concrete ,aggregates and water added to concrete mix before or during mix of concrete to improve certain properties in fresh or hardened state.
Function of Admixtures:
- To accelerate initial set of concrete i.e speedup the rate of development of strength at early age.
- To restart or delay.i.e delay initial state keep concrete workable for longer time for placement.
- To enhance the workability.
- To improve the penetration .
- To reduce the segregation in growth.
- To increase the strength of the concrete by reducing the water content and by densification of concrete.
- To increase the durability of the concrete .
- To reduce the capability flow of water to increase the permeability of the liquids.
- To inhabit the corrosion of reinforcement in the concrete.
- To reduce the heat of hydration.
- To increase the bond between old and new concrete surfaces.
- To enhance the bond of concrete and steel reinforcement.
- To produce non-skidding varing surface.
- To produce coloured concrete .
- To decrease the weight of the concrete.
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