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Re: [TowerTalk] concrete set time

To: k9mk@flash.net, towertalk@contesting.com
Subject: Re: [TowerTalk] concrete set time
From: jim Jarvis <jimjarvis@optonline.net>
Date: Tue, 07 Jul 2009 14:44:25 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Yup.  you're right.

I went looking on wikipedia,  with the thought that I could get to an  
ASTM table which
might have dealt with slump vs. strength...   struck out.

and slumped at my desk, in defeat.

Sorry if I misled anyone.

N2EA

On Jul 7, 2009, at 2:37 PM, k9mk@flash.net wrote:

> 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@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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> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk

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