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The aim of the designer should always be to get concrete mixtures of optimum strength at _________ cement content and ________ workability.

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The aim of the designer should always be to get concrete mixtures of optimum strength at _________ cement content and ________ workability.

(a) Maximum, Nonacceptable

(b) Minimum, Nonacceptable

(c) Maximum, acceptable

(d) Minimum, acceptable

I got this question in an international level competition.

I would like to ask this question from American Concrete Method of Mix Design in portion Concrete Mix Design of Concrete Technology

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The correct choice is (d) Minimum, acceptable

Explanation: The aim of the designer should always be to get concrete mixtures of optimum strength at minimum cement content and acceptable workability.

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