[TowerTalk] CONCRETE CURING

[Pete Smith]

It seems to me that this discussion is missing one important distinction - guyed tower vs self-supporting.  The latter puts much more strain on the base and any embedded foundation pieces, while the load from a guyed tower is almost all vertical compression.  One former denizen of this reflector had several fairly tall Rohn 25 towers simply footed in gravel.  Our old ham club had a short one (20')mounted on top of a building in DC with the base simply guyed across the roof to several vent pipes , to keep it from popping out (yes, we WERE nuts), considering the liability implications, but this was the 70's)

73, Pete N4ZR

At 09:05 PM 8/28/2006, NØATH wrote:
>At the KCPL power plant where the concrete stacks are 750 feet tall - they 
>said
>the magic number for max strength was 28 days.  A lot of difference between 
>a
>750 stack and a short foundation though. Not trying to add fuel - just 
>commenting
>Dave / NØATH
>
>
>
>I would say one week is not enough, remember the compression/tension from a
>tower in wind is a lot more stressful than foundations.  I think you are
>guessing, the people who poured my concrete said they always recommend 3 to
>4 weeks for towers or longer for complete curing.
>
>Mike
>
>
>Most builders will cap a foundation within a week of a pour.
>
>Lots of them  will start framing at the same time. My sense is a week
>is good enough.
>
>
>
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