Question
Air entrainment Portland cement
i) offers great resistance to sulphate attack
ii) offers great resistance to freezing and thawing
iii) reduces the possibility of shrinkage and crack formation in the concrete surface
iv) better workability
A. Only i)
B. i) and ii)
C. i), ii) and iii)
D. i), ii), iii) and iv)
Answer: Option D – i), ii), iii) and iv)
Explanation:
The use of air entraining admixture allows the following:
1. Higher workability
2. Higher resistance against frost action (freezing and thawing).
3. Higher durability
4. Higher resistance against bleeding and segregation.
5. Low unit weight due to presence of air bubbles.
6. Less compressive strength and Less possibility of development of shrinkage cracks.