Wayne Whitney wrote:
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.

You will greatly weaken the resulting product. Hardly worth it.

--
Joseph Meehan

Dia 's Muire duit