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I Learned This Labor-Saving Trick for Installing Fence Posts in Concrete—Without Having to Use Water
This might work for posts, but this is not going to result in strong concrete. Concrete doesn't just dry; it requires a specific ratio of water to cure. Water doesn't percolate through concrete mix in a way that gives the whole mixture the optimal ratio of water to cement.
Amen.
Have you seen this: https://www.youtube.com/watch?v=1Sp5MU9AL14
$12 80lbs bag of concrete $4.50
Since it foams, you need far less of it to fill the same volume.
I can tell that you're REALLY from the city because you called it "local" soil.
This is old news. Been doing this for ever. Usually the ground is moist enough you really don't need to wait for rain.
"wait for it to rain" ... love that! :-)
:-0