[TowerTalk] Concrete base spec info requested

[Tod - ID]

 My foundation was poured with 4000 psi. Did not cost extra -- it is the
standard mix locally.

Tod, KØTO



> -----Original Message-----
> From: towertalk-bounces at contesting.com 
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Ray
> Sent: Sunday, October 25, 2009 7:33 PM
> To: towertalk at contesting.com
> Cc: Skip. KJ6Y; Hector, XE2K
> Subject: [TowerTalk] Concrete base spec info requested
> 
> I am pouring two tower bases on Tuesday. I am looking for 
> some general info on the concreted needed for the bases. The 
> towers are older, US Tower - MA770 and a Tristao - CZ 471. 
> Both engineering details (1999 and 1977) state the concrete 
> Fc is 2000 lbs. I think this means the compressive strength 
> of the concrete. I thought the typical strength is 2500 lbs, 
> and if I remember correctly, on another 70 ft tower I poured 
> 30 years ago, I used 3500 lbs strength.
>  
> Can anyone tell me if I should be using 2000 lbs concrete? 
> And are there any other additives that should or could be used? 
>  
> Ray,
> N6VR
>  
> (Near Prescott, AZ)
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