[TowerTalk] Concrete Base?

[Alan NV8A (ex. AB2OS)]

But if the tower manufacturer's spec. already calls for 4,000 psi 
concrete (for example), shouldn't one wait until it has come pretty 
close to 4,000 psi before imposing the full load on it?

Alan NV8A


On 11/17/04 08:02 pm Kelly Taylor put fingers to keyboard and launched 
the following message into cyberspace:

> Isn't it one of LXC's tips to order 4,000 psi, which cures to 3,000 psi
> rather quickly? I forget the exact times, but it seemed that ordering
> stronger concrete than you need shaved considerably the wait for the design
> specification strength. Then the extra curing was gravy.
> 
> 73, kelly
> ve4xt
> ----- Original Message -----
> From: "RICHARD BOYD" <ke3q at msn.com>
> To: <towertalk at contesting.com>
> Sent: Wednesday, November 17, 2004 6:48 PM
> Subject: Re: [TowerTalk] Concrete Base?
> 
> 
> 
>>I remember when this discussion came up some years back some professional
>>concrete guys told us that the concrete, unless it was an extra wet mix,
>>cured to 80-90% of its ultimate strength within 24-48 hours, in reasonably
>>dry weather, etc..  That last bit takes a long time but most of the
> strength comes fast.