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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Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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