That suggests to me the ballast is possibly contaminated with organic matter other than "roots" ? (roots of what?) Any such contamination will not be good for concrete longevity, it all needs to be "clean".
Has the bag been folded or covered over all these years? Or open to the elements?
May be as well to use it on paths or somesuch & buy fresh for concreting?
I've had a big builder's bag of ballast in the garden for a few years, when I went to make up some concrete there were roots in it.
If I pull the biggest ones out is it OK to use?
Maybe not for foundations as the roots could grow and crack?
advice please...
It needs to be heated to a high temperature if you want to use it I think, to kill of anything organic. Brian
It was covered, but a few leaves have got in there, thinking back it could have been there for 5 years.. so just use it for non structural jobs like paths
[g]
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