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For making cement paste, what is the amount of water we need?

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For making cement paste, what is the amount of water we need?

(a) 25% water by weight of dry cement

(b) 30% water by weight of dry cement

(c) 78% water by weight of dry cement

(d) 80% water by weight of dry cement

The question was asked in an interview.

Asked question is from Standard Consistency Test in portion Types of Cement and Testing of Cement of Concrete Technology

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Right choice is (a) 25% water by weight of dry cement

To explain I would say: 25% water by weight of dry cement thoroughly to get a cement paste. Total time taken to obtain thoroughly mixed water cement paste.

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