Admixtures are the ingredients in concrete other than portland cement, water, and aggregate that are added to the mix immediately before or during mixing. Admixtures are Liquid or powder products which modify and improve the properties of fresh and hardened concrete or mortar.
Admixtures play a vital role in production of quality concrete and mortars in all segments of the industry – Ready-mix, Precast and Site-batch. It is the ingredients in concrete other than cement, water and aggregate that is added to the mix immediately before or during mixing.
- Plasticisers:Conplast P211
- Superplasticisers:Conplast SP430
- Corrosion inhibitors:
- Pumping aids
- Specialty admixtures
- Accelerators:Conplast NC
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.