[TowerTalk] RE: Erecting tower

[WD0M]

Same story that I got from my local concrete guys (and a cousin who is in 
the concrete business).  Must be true!

73,
Joe
WD0M

At 01:34 PM 12/5/2003, gdaught6 at stanford.edu wrote:
>On 5 Dec 2003 at 10:50, WD0M wrote:
>
> > I just poured a base for a self-supporting US Towers TX-455 - the
> > local concrete guys said 7 days is sufficient.  I used 4000 psi concrete
>
>My concrete guy (actually retired concrete guy, but doing occasional
>jobs to pick up a few bucks) explained it to me this way, which
>seemed very logical.
>
>You can take the forms off after 24+ hours, because it's set up
>satisfactorily by then.  In about a week, it'll be at about 75%
>strength, so you can do pretty much whatever building you need to do
>after that time.  After a month it's up to full rated strength, and
>although it continues to cure, it changes very little after that.  So
>your 4000 psi concrete is at about 3000 psi after a week.
>
>I hasten to add that I'M NOT the concrete expert, but just repeating
>what I was told.
>
>73,
>
>George T. Daughters, K6GT