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Admixture can refer to:

  • Genetic admixture, the result of interbreeding between two or more previously isolated populations within a species.
  • Racial admixture, admixture between humans, also referred to as Miscegenation
  • Hybrid
  • Mixture, the chemical substance which results when two different materials are combined without occurrence of chemical reactions
  • Admixture (concrete), the chemicals used to aid the properties of concrete or cement

Why is admixture used?

Over decades, attempts have been made to obtain concrete with certain desired characteristics such as high compressive strength, high workability, and high performance and durability parameters to meet the requirement of complexity of modern structures.The properties commonly modified are the heat of hydration, accelerate or retard setting time, workability, water reduction, dispersion and air-entrainment, impermeability and durability factors.

Types of admixtures

Chemical admixtures - Accelerators, Retarders, Water-reducing agents, Super plasticizers, Air entraining agents etc.

Mineral admixtures - Fly-ash Blast-furnace slag, Silica fume and Rice husk Ash etc