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The mineral oil if present in mixing for concrete ______________

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The mineral oil if present in mixing for concrete ______________

(a) Improves strength

(b) Reduces strength

(c) Gives more slump

(d) Gives a smooth surface

This question was addressed to me at a job interview.

My question comes from Sampling in chapter Concrete Mix Design of Concrete Technology

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Right option is (a) Improves strength

The best I can explain: The mineral oil is present in mixing for concrete increases strength for the concentration up to 2%.

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