DIYbanter - View Single Post

wrote:
Does bagged ordinary portland cement get stale after a while? --in
other words does it lose it's ability to perform up to it's
specification? If so, how can I tell if its not worth using?

I have about 5 sacks that have sat in my garage for several years.
While the powder hasn't
hardened its somewhat cakey or crusty.

Humidity get's to it and it's no longer anywhere near it's rated strength.
What you've now got is some fill, admittedly something that will, when
mixed with water pack down realy good. If all you're doing is a very low
demand fencepost sort of thing, sure, maybe for some out of sight fill.
But other than that, it's shot: anything you mix up will be very low
strength and crumbly.

John
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