[TowerTalk] Concrete "Slump"

Jim White, K4OJ k4oj at tampabay.rr.com
Thu May 29 15:23:36 EDT 2003

The hardness of your concrete is its PSI - 3000 is very standard, 
probably what they usually mix for residential stuff - sometimes harder 
concrete is used in commercial construction applications...

The slump of your concrete is how stiff the mix is - i.e. how much water 
is in it when it is poured...thinner mixes (more water) will flow around 
small areas easier than a stiff mix is - I would say 5" slump should be 
fine as well... imagine taking a soup can full of the concrete mix and 
then inverting it - the cylindrical piece would slowly "slump" as 
gravity did it s deed and it settled


Jim, K4OJ

Jerry Keller wrote:
> Following advice received here (thanks!), I had the concrete guy here today
> to advise on my site for a 5' x 5' x 6' deep base pour. He asked if I wanted
> "3000 Lb. concrete". And he asked if I wanted a "5 inch slump".  I told him
> I'd get back to him.  What do these terms mean? What should I want?
> Jerry K3BZ
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