→ Plasticizers :- It is a mixture of organic and inorganic substances that permits the reduction in water-cement Ratio at same workability or offers higher workability at same water-cement ratio. → Metakaolin :- It is the anhydrous calcinated form of the clay mineral kaolinite. It is a pozzolana, probably the most effective pozzolanic material for use in concrete. → Accelerator :- These are type of admixture which increases the rate of hydration there by helps in attaining the higher rate of gain of strength. → Retarders :- It slows down the chemical process of hydration.