The most commonly used admixture which prolongs ...

The most commonly used admixture which prolongs ...

Plasticizers

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Plasticizers are a combination of organic and inorganic substances. They allow for a reduction in the water/cement (W/C) ratio while maintaining the same workability, or they enhance workability without changing the W/C ratio.

Examples include lignosulphate, polyglycol ester, carbohydrates, and hydroxylated carboxylic acid.

Superplasticizers

Superplasticizers function similarly to regular plasticizers but differ chemically. They significantly improve concrete flow without increasing water content.

Examples include modified lignosulphonate, sulphonated melamine formaldehyde (SMF), and sulphonated naphthalene formaldehyde.

Retarders

Retarders are admixtures that slow down the hydration process of cement. This delay keeps the mix plastic and workable for a longer time compared to mixtures without retarders.

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Examples of retarders include calcium sulphate, tartaric acid, starch, sugar cellulose.

Accelerators

Accelerators are admixtures that speed up the strength development in concrete. They help the concrete gain strength faster.

Examples include calcium chloride, silicates, and flousilicate.

Air-Entraining Admixtures

Air-entraining admixtures trap millions of tiny air bubbles within the concrete mix. These bubbles act as flexible micro-ball bearings that enhance concrete’s workability and resistance to frost, segregation, and bleeding.

Examples include natural wood resin, plant and animal fatty oils, stearic acid, oleic acid, hydrogen peroxide, and aluminium powder.

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