[TowerTalk] Concrete Set Time

[Dino Darling]

This is good information Mike.  In Colorado, we had winter concrete
blankets that would keep in the heat and stop the surface water from
freezing.  In the summer, burlap bags help keep in the moisture in the
dry climate of the Mile High City.

We were walking on slabs within hours of pouring, with the Soff Cut saw.
 Sooner with the ride-on trowels.

The concrete reaches adequate hardness in the first 24 hours (I don't
remember it ever being 7-days), and close to rated capacity in 28 or so.

I've know guys who mount their towers after the first 24, but I never
recommend that.  Patience is key!

Dino - KX6D

-------- Original Message --------
Subject: Re: [TowerTalk] Concrete Set Time
From: "Mike & Becca Krzystyniak" <k9mk at flash.net>
Date: Mon, July 06, 2009 7:57 pm
To: "'Gary "Joe" Mayfield'" <gary_mayfield at hotmail.com>, "'Tower Talk
List'" <towertalk at contesting.com>

Joe,

 Assuming your concrete was poured around the securely positioned anchor
bolts the concrete will set in two to four hours, depending on the mix,
and
attain 75 percent of its ultimate strength in about 7 days. Keeping
things
moist, the concrete cures to 90 percent compression strength in about 28
days. 

 Curing conditions for concrete are as crucial to strength as adequate
curing time. Temperature fluctuations, or temperatures below 40 degrees,
or
above 90 degrees Fahrenheit can inhibit concrete curing, ultimately
causing
anchor bolts to fail. Plan concrete placement during favorable weather.
Keep
concrete surfaces wet while curing, to dissipate heat and prevent
surface
evaporation.

MK



-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Gary "Joe"
Mayfield
Sent: Monday, July 06, 2009 8:46 PM
To: 'Tower Talk List'
Subject: [TowerTalk] Concrete Set Time

How long after the concrete truck leaves before I can safely raise my
HDBX-48 with hexbeam on top? 3 weeks? A month? 6 weeks?

Thanks and 73,
Joe kk0sd

_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk


_______________________________________________



_______________________________________________
TowerTalk mailing list
TowerTalk at contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk