Which of the following agent does not enhance the workability of concrete?
Show Hint
- Plasticizer
- Silica fume
- Air entraining agents
- Super plasticizer
The Correct Option is B
Solution and Explanation
Workability of concrete refers to how easily it can be mixed, placed, compacted, and finished without segregation. Several chemical admixtures are used to improve the workability of concrete:
- Plasticizers and Superplasticizers reduce water content and improve flow.
- Air entraining agents introduce tiny air bubbles that enhance workability and resistance to freeze-thaw cycles.
On the other hand, Silica fume is a pozzolanic material used to increase the strength and durability of concrete. However, it actually reduces workability due to its very fine particle size and high surface area, which increases water demand.
Hence, among the given options, silica fume does not enhance workability. \[ \text{Answer: Silica fume} ⇒ \text{Reduces workability} \]
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