[TowerTalk] concrete set time

[k9mk at flash.net]

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. 
> _______________________________________________ 
> 
> 
> 
> _______________________________________________ 
> TowerTalk mailing list 
> TowerTalk at contesting.com 
> http://lists.contesting.com/mailman/listinfo/towertalk