[TowerTalk] Concrete Strength

[Dan Bookwalter <n8dcj@yahoo.com>]

I seem to recall from about 8 years ago that concrete is up to 75% of its 
strength in 72 hours or something like that. UST calls out 2500 PSI concrete 
after 28 days , so that i don't have to wait a month i was going to use 4000 
PSI 
concrete and put the tower on it after a week or so , thoughts ?

Dan N8DCJ



      
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