eli5: why you need to water concrete for first couple of days?

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Why do they say to water walls of newly constructed buildings? This is mostly for the brick walls constructed by using cement for first few days.

EDIT: they say it increases the strength but I never understood how does it happen.

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2 Answers

Anonymous 0 Comments

Curing cement produces heat, and cracks when dried out. One waters them to prevent the cracking.

Anonymous 0 Comments

Concrete does not “dry”, it “sets” via a chemical reaction that uses up water and binds it into a new chemical compound. That reaction is even called “hydration”. If there is not enough water, the reaction will not go through, and concrete will be weaker.