Civil Engineering MCQAE Level Civil Engineering
Air entraining admixtures in concrete are used primarily in:
Building MaterialsAdmixtures ConcreteMEDIUM
Choose the correct answer
A
High-strength concrete
B
Hot weather concreting
C
Freeze-thaw resistant concrete — entrained air voids allow ice expansion without microcracking
D
Underwater concrete
Correct Answer
C. Freeze-thaw resistant concrete — entrained air voids allow ice expansion without microcracking
Why is this the answer?
Air-entrained concrete: tiny air bubbles (3–6% by volume) distributed in paste provide relief when water in pores freezes and expands. Essential for pavement concrete in frost-prone areas. Reduces strength ~5% per 1% air.
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This MCQ belongs to Magic Mock Test Series — UPSC ESE Civil (Paper II). Full tests include timed attempts, rank comparison and subject-wise analysis.