[TowerTalk] Concrete; Abosrbs water? Porous?

[Pat Barthelow]

Jim Said:
>Almost all standards call for the rebar to be completely inside the
>concrete for just this reason.  You don't want a small crack exposed to
>allow water to infiltrate with capillary action.
>
>Jim, W6RMK

I may learn somethng here.....It is my gut level impression that buried 
concrete in wet or damp ground absorbs moisture.  Isn't concrete porous, 
easily absorbing water thorugh it's contact surface with wet ground?

73, Pat aa6eg at hotmail.com