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Contractors place blankets over the concrete to ____________

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Contractors place blankets over the concrete to ____________

(a) Increase the rate of evaporation

(b) Slow the rate of evaporation

(c) To increase the strength

(d) Ease to do work

This question was addressed to me in an interview for job.

I would like to ask this question from Curing of Fresh Concrete topic in chapter Fresh Concrete of Concrete Technology

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Right choice is (b) Slow the rate of evaporation

The explanation is: A more common practice is for contractors to place blankets over the slab surface to slow the rate of evaporation.

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