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Maximum size of aggregates are used to produce 70MPa compressive strength?

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Maximum size of aggregates are used to produce 70MPa compressive strength?

(a) 20-30 mm

(b) 10-20 mm

(c) 30-40 mm

(d) 40-50 mm

I have been asked this question in an internship interview.

This intriguing question comes from No Fines Concrete, High Density Concrete topic in division Special Concrete and Concreting Methods of Concrete Technology

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Right choice is (a) 20-30 mm

The explanation is: Maximum size of aggregates is 20-30 mm are used to produce 70MPa compressive strength.

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