Which of the following is NOT a retarding admixture?

Various admixtures

Properties

Examples

Accelerator

• They accelerate the hardening process.
•  Speed the setting time and thus cure time starts earlier.

Calcium chloride, soluble carbonates, silicates, fluorosilicates, etc.

Retarder

• It slows down the chemical process of hydration, so used in Hot weather conditions.

Sugar, carbohydrates, zinc salts, borates, calcium sulphate, starch etc.

Air Entraining

• They produce air bubbles in the concrete, which act as flexible ball bearings and increase the fluidity of the concrete.

wood resins, Animal and vegetable fats, oils, alkali salts, etc.

Plasticizer

• Plasticizers are those admixtures that reduce water requirements and increase the workability of concrete.

Lignosulphonates, salts of sulphonates, hydrocarbons, polyglycol esters, carbohydrates, etc.

Superplasticizer

• These are improved versions of plasticizers also known as high-range water reducers.
• Using this helps in the production of flowing, self-leveling, self-compacting, high-strength, and high-performance concrete.

Modified lignosulphonate, sulfonated melamine-formaldehyde, sulfonated naphthalene-forriehyde, acrylic po