Question

Admixtures are added to concrete to 1. increases its strength 2. Reduce heat of hydration 3. Delay the setting of cement 4. Reduce water-cement ratio. Which of these statements is/are correct? a) 1 only b) 1 and 2 c) 2 and 3 d) 3 and 4

Answer 1

Answer:

The correct answer is option d) $3$ and $4$.

Explanation:

• Concrete admixtures are substances that are added to fresh or hardened concrete during mixing to improve certain qualities, such as workability, durability, or early and final strength.
• The most prevalent accelerator component, calcium chloride, may actually encourage corrosion of steel reinforcement.
• Through the decrease of water/cement, hydrophobic effect, pore reduction/blocking, increased density, and other properties, additives have improved the compressive strength and durability of concrete. Due to this, their application in the modern building sector has significantly increased.
• In a variety of applications, mortar or concrete's fresh and hardened qualities are enhanced by chemical admixtures.
• Their inclusion may enable the water to cement ratio to be decreased without compromising the mixture's workability.

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