My foundation was poured with 4000 psi. Did not cost extra -- it is the
standard mix locally.
> -----Original Message-----
> From: email@example.com
> [mailto:firstname.lastname@example.org] On Behalf Of Ray
> Sent: Sunday, October 25, 2009 7:33 PM
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> 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?
> (Near Prescott, AZ)
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