Thanks, Patrick. The manual for the tower calls for "minimum 28 day strength of
2000 psi and no more than 7 1/2 gal. of water per sack of cement".
Mike NF4L
On Nov 30, 2013, at 4:05 PM, Patrick Greenlee <patrick_g@windstream.net> wrote:
> Mike, The Portland Cement Association says that standard mixes cure to 90% of
> their final strength in 28 days. There is no magic number for 100% cure.
> Strength asymptotically approaches its final value and (theoretically) never
> quite gets to 100% but surely CLOSE ENOUGH. Depending on your mix and
> weather (and moisture etc.) at what point along the way toward 28 days will
> it be strong enough for your needs? Unless the strength of your mix is
> marginal at 90% you should be OK after 3 weeks or so. Sooner MIGHT be OK but
> why set yourself up to regret at your leisure what you might do in haste.
> Consider the hassle if you load it prematurely and let that color your
> decision.
>
> 73 and best of luck to you,
>
> Patrick AF5CK
>
> -----Original Message----- From: Mike Reublin NF4L
> Sent: Saturday, November 30, 2013 9:38 AM
> To: towertalk reflector
> Subject: [TowerTalk] More crank-up questions
>
> I plan to put up a motorized HG-70 HD, with a 4 element SteppIR and a 7
> element M2 6M beam.
>
> Hy-Gain says 1 week for foundation curing, UST says 4 weeks. What's realistic?
>
> My current guyed tower has a side-mounted G-7 and a couple of vhf verticals.
> How best to mount those on the crank-up? I was thinking of hanging the G-7
> upside down.
>
> Does this tower have latches, or is the weight on the cables when extended?
>
> What about limit switches or stops?
>
> I'd like to carry over my 80 and 160M 1/4 wave slopers. Is that too much
> stress? What about ground continuity top to bottom?
>
> Does the concrete/rebar cage make a Ufer ground? Do I need ground rods in
> addition?
>
> 73, Mike NF4L
> _______________________________________________
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