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What is the maximum w/c ratio?

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in Concrete Technology by (122k points)
What is the maximum w/c ratio?

(a) .2

(b) .3

(c) .4

(d) .5

I have been asked this question in a job interview.

Asked question is from Cracking of Concrete, Evaluation of Cracks in chapter Repair Technology for Concrete Structures of Concrete Technology

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Right answer is (d) .5

To explain: Water cement ratio should not exceed .5 in concreting because it will reduces the workability of the concrete.

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