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Approximate ratio of strength of the 30 cm cube to that of 15 cm cube is _____________

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Approximate ratio of strength of the 30 cm cube to that of 15 cm cube is _____________

(a) 1.1

(b) 1

(c) .9

(d) .75

The question was posed to me in a national level competition.

I'm obligated to ask this question of Strength and Durability Relationship in division Durability of Concrete of Concrete Technology

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Right option is (c) .9

For explanation: The strength of cylinder with diameter of 15cm and 30cm tall can be approximated as 0.84 of the strength of a 15x15x15 cm cube according to Eurocodes.

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