[TowerTalk] RE: Erecting tower

[kr7x at comcast.net]

George:

That is pretty close to how it is. For everything but columns,elevated beams, and shear walls we spec stripping is ok after 7 days, for the execptions we use 14 days.

73
Hank Lonberg, P.E.,S.E. / KR7X
Lonberg Design Group, Ltd.
> 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
> 
> 
> 
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> 
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