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Posted by Don Young on April 12, 2007, 9:46 pm
> Hello,
>
> I have some concrete sack mix that has gone stale from being exposed
> to exterior humidity for too long. I discovered this when the small
> step I tried casting was very crumbly 24 hours later. So a few
> questions:
>
> I'm wondering if the unused bags of sack mix are still useful as an
> aggregate mixture. Can they be combined with fresh portland cement to
> make a good concrete mix? Or will the presence of the hydrated
> portland cement interfere somehow?
>
> Also, what about the crumbly non-concrete? It easily breaks up into a
> mixture resembling aggregate and wet sand, so I was wondering if it
> too could be combined with fresh portland cement and reused. Of
> course, it is easy to imagine that it would be too wet, or the mix of
> particle sizes is wrong, or whatever. Note that I'm just casting a
> concrete bottom step, so I'd be happy with 2000 psi concrete.
>
> Thanks, Wayne
>
>
I think the labor in making the step justifies using known good material,
which isn't very expensive. I would not use the old mix for anything but
fill.
Don Young
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