[TowerTalk] RE: TowerTalk Digest, Vol 23, Issue 52

[Michael Tope]

I saw a documentary recently on the Grand Coulee Dam in Eastern
Washington. When they built it, they were pouring concrete 24/7 with
13 ton hoppers for something like a year to get the dam finished.
Because the hydration reaction is exothermic, they had to run cooling
water pipes through the concrete to speed up the curing, otherwise
it would have taken hundreds of years to get the structure up to its
desired strength.  Pretty amazing!

73 de Mike, W4EF.....................................................

P.S. If your tower base needs cooling pipes, your antenna is too big :)

----- Original Message -----
From: "Keith Dutson" <kjdutson at earthlink.net>
To: <towertalk at contesting.com>
Sent: Sunday, November 14, 2004 7:11 PM
Subject: RE: [TowerTalk] RE: TowerTalk Digest, Vol 23, Issue 52


> I have heard 28 days is more than 90 percent strength, and never reaches
100
> percent cured.
>
> Keith NM5G
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Mike Maddox
> Sent: Sunday, November 14, 2004 6:46 PM
> To: towertalk at contesting.com
> Subject: [TowerTalk] RE: TowerTalk Digest, Vol 23, Issue 52
>
>
>
>
> Hello All,
>
> I have a question regarding tower base concrete.
>
> How long should concrete cure after pouring to be safe to install a
> crank-up, tilt over tower???
> The mix is 3500 psi.
>
> Many Thanks in advance.  73,  Ted  K2QMF
>
>
> Without additives, 28 days til 50% strength.  Years until anything
> approaching 90%.  You should consider at least 7 days before putting mush
> stress on it, it's still green for several days.  Cold temps will delay it
> even more.  Even if it's stressed before it should be, and doesn't crack,
> does not means it hasn't been damaged and will later fail.  How long do
you
> expect this install to last?
>
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
> Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with
any
> questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any
questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>