It's totally depends upon Specific gravity of aggregate and concrete requirements in fresh and harden stage. Accordingly concrete trials required to optimise the proportion.
To prevent the RCC surface from evaporation losses is the main reason for curing. If the casted surface is not exposed till 7 days or 10days then there is no need of water curing .....
I would like to appreciate your efforts taken to create awareness about the good construction practices. This type of presentation not only help GET but also experienced engineer also learnt a lot. keep up the good work.
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