[TowerTalk] concrete set time
jim Jarvis
jimjarvis at optonline.net
Tue Jul 7 10:59:34 PDT 2009
Julio Peralta wrote:
> I've always wondered how the average guy can tell the difference
> between
> 2500 and 5000 PSI concrete when it's delivered. It's my
> understanding that a
> test cylinder has to be poured and sent to a lab to determine the PSI
> strength. Couldn't a concrete company tell you its 5000 PSI and
> deliver
> something much less than that?
>
> Julio, W4HY
>
The only time I did this, we had a structural engineer on the team.
Before the
concrete was poured, he did a "slump" test. Poured a cone of the
stuff, and
measured how much it deflected downward. Evidently, that's an
indicator of
the eventual strength of the material.
n2ea
ps: I agree with Steve. By letting the concrete company know
you're testing,
they'll be careful to get the right stuff.
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