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Posted by Maxwell on October 9, 2007, 9:01 pm
> Is there a quicker way to judge the flowability of redi-mix concrete than
> a slump test?
>
> I have been pouring some of my own concrete with little experience, but it
> seems the hardest part is judging what the redi-mix company has sent me.
> Seems no mater what slump I order, there is never any consistency in what
> a receive, other than it is always much too stiff.
>
> Also, when you have to add water to a truck load of 3 or 4 slump, how long
> must the mixer run to insure a uniform mixture of something like a 6
> slump?
>
> I am told about 10 gallons per yard will raise (or lower) the slump 1".
> Is this good info.
>
> Any and all help appreciated, as well as where to buy a cone or something
> for on-site testing.
>
Thanks so much for all the input guys, I need all the help I can get.
Two things I forgot to mention originally is,
I'm pouring 4" patio slabs on a literally a river sand base,
and the I am getting "zero" cooperation from the concrete companies.
I have tried three different vendors for four different pours now, and got
something different every time. The last order would hardly come down three
sections of side, lowered all the way to the ground, and the driver swore it
was a 6 when it left the plant, about 5 miles away by expressway.
So I really seem to be on my own. I have been buying 5 to 8 yards at a time,
and adding at least 2 gallons per yard to each batch. Even though I always
specify a 6 slump. So it would appear I will have to guess at the first add
( from 1 to 2 gal per yard), run the mixer 30 turns or so, and then run my
own slump test before attempting to use anything I buy.
I realize the mix is costing me some ultimate strength, but that hasn't been
a problem yet. Except when the driver of the third pour wound up mixing
soup. I did get some hairline cracking out of that one. Fortunately not a
real killed on this particular job, but I do want to avoid it in the future.
Again, thanks to all that have helped.
Max
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