Dear Readers,
Concrete is widely used in civil engineering and construction. In the concrete mixing process or before the concrete mixing can make the concrete hardening, mixing better materials, called concrete admixtures.
Various types of admixtures are used in concrete to enhance the performance of concrete. Concrete admixture is defined as the material other than the aggregate, water and cement added to the concrete. Admixtures are artificial or natural, and it may be added to the concrete mix, just before or during the mixing, to change one or more properties of the concrete in the plastic or hardened state as required in our structure.
The successful use of admixtures depends on the proper combination of ingredients and concrete. Most admixtures are supplied in ready-to-use liquid form and are added to the concrete at the factory or construction site. Some additives such as pigments, extenders, and pumping agent, etc., used only in extremely small amounts, generally from the vessel manually pre-measured ingredients.
Types and Functions of admixtures are as Follows.
There are two types of admixtures:
Mineral admixtures
Chemical admixtures
(1) Mineral admixtures
Followings are the types of Mineral admixture:
Fly ash
Silica fume
Ground granulated blast furnace slag
Rice husk ash
(2) Chemical admixtures
Chemical admixtures are various types, and they are:
Accelerating admixture
Retarding admixture
Water – reducing admixture
Air – entraining admixture
Super plasticizing admixture
Special Admixtures based on the application
Pozzolanic Admixtures
Damp-proofing Admixtures
Gas forming Admixtures
Air detraining Admixtures
Alkali Aggregate Expansion Inhibiting Admixtures
Anti-washout Admixtures
Grouting Admixtures
Corrosion Inhibiting Admixtures
Fungicidal, Germicidal, Insecticidal Admixtures
Coloring Admixtures Bonding Admixtures
