Admixture is a material other than water, aggregates and hydraulic cement abd additives like pozzolana or slag and fibre reinforcement used as an ingredient of concrete or mortar and added to the batch immediately before or during its mixing to modify one or more of the different types of admixtures are as follows:
(a) Accelerating Admixtures or Accelerators: An admixture when added to concrete, mortar or grout. increases the rate of hydration of a hydraulic cement, shortens the time to set, or increase the rate of hardening or strength development.
(b) Retarding Admixture or Retarder: An admixture which delays the setting of cement paste, and hence of mixtures, such as mortar or concrete containing cement.
(c) Water Reducing Admixture or Workability Aid: An admixture which either increases workability of freshly mixed mortar or concrete without increasing water content or maintain workability with reduced amount of water.
(d) Air-Entraining Admixtures: An admixture for concrete or mortar which causes air to be incorporated in the form of minute bubbles in the concrete or mortar during mixing, usually to increase workability and resistance to freezing and thawing and disruptive action of de-icing salts.
(e) Superplasticizing Admixtures: An admixture for mortar or concrete which imparts very high workability or allows a large decrease in water content for a given workability.
(f) Retarding Supreplasticizing admixture: Retarding Superplasticizing admixture imparts prolonged workability retention and retards setting.
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