Really have no idea on what causing concrete to have air voids in it. Is it causes by evaporation of water during the hydration process?

  • Isn't it just air entrained in the thick concrete during the pour, especially as it moves past rebar? – Daniel Griscom Jul 3 '16 at 12:50

When concrete is mixed it has air trapped in the mix. When pouring walls we use vibrators to get the air out. With smaller pours hitting the forms with a hammer helps.

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