have had some ready mixed cement stored in a shed for about a year or so.
although it's a bit solid, if i scrape at it, it then goes powdery, so i could mix it up.
could i use this old mix for anything? someone has told me if i do it will not have much strength? but even so i guess there are little jobs around the garden that dont require much strength?
You could mix it up, but it won't have any strength when it sets. You see, cement cures by a chemical reaction with the water that's added to it. In your bag of old cement, that reaction has already taken place, with humidity in the air. You can't make concrete with that stuff. It will set, but it will crumble the first time any stress is applied to it.
Sure - if your soil is too acidic, you can mix some of that cement into the soil to make it more alkaline.
In the winter, if your walk or driveway is covered with ice, you could spread some of it around to provide traction, and possibly help melt the ice.
If you have any plants you want to kill, you could dump it on top of them.
Not for making concrete. Just buy some more. It's cheap.
You could add more strength to it by mixing it with cement in a ratio of perhaps 1 part cement to 8 part ready mix concrete. Make sure you break up the ready mix really well first.
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