[TowerTalk] concrete set time
k9mk at flash.net
k9mk at flash.net
Tue Jul 7 11:37:02 PDT 2009
Slump is a term used to describe how consistent a concrete sample is from batch to batch. The test is more for consistency of the mud (wet versus soupy) . That gives the crew a relatively consistent mud to work with. When I poured my shop, there were 9 trucks delivering. Each truck had to pass the slump test before they were allowed to eject their loads.
MK
-------------- Original message from jim Jarvis <jimjarvis at optonline.net>: --------------
>
>
> 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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