The mixing of concrete can accelerate the setting time.
There are some enzymes that work as an anti-bacterial agent.
There are mixtures of concrete that reduce the initial strength but increase the strength of hardened concrete compared to normal concrete.
It reduces the initial heat of hydration and overcomes the problem of thermal cracking in concrete; if there is excess heat of hydration the cracks can spread to the fresh concrete.
Admixtures improve the resistance against the freeze-melting effect on concrete.
Concrete mixtures maintain maximum stability by bringing waste products into use
Admixtures reduce the required amount of cement and make concrete economical.