What is the function of plasticizers in concrete?

• A. Increase cement content
• B. Improve workability without adding more water
• C. Decrease setting time
• D. Increase strength

Answer: (B)

Plasticizers are water-reducing admixtures that make fresh concrete easier to work with without adding extra water. They work by dispersing cement particles and reducing friction inside the paste, so the mixture flows more easily. This means you can achieve the desired workability with less water, or maintain the same workability with lower water content. Lowering the water–cement ratio while keeping workability improves the potential strength and durability of the hardened concrete. They don’t inherently change the setting time, and they don’t add cement.