Which one of the following is NOT a property of an admixture ?
- AImprove workability
- BIncrease strength
- CImprove durability
- DIncrease permeabilityCorrect
Solution
Concept
Purpose of admixtures
Step-by-step solution
1. Admixtures improve workability, strength and durability. 2. Increased permeability is undesirable and is not a purpose.
Explanation
Admixtures such as water reducers and air entrainers aim to make concrete workable, strong and durable and less permeable.
Why the other options are wrong
(a), (b) and (c) are standard benefits.
Shortcut
Admixtures reduce permeability.
Correct answer: D) Increase permeability