As I learned during the construction of my dog-fenced run, erecting farm infrastructure is a combination of hard work and clever labor-saving tricks.
The fence is 300 feet long, with thirty 4x4 posts set ten feet apart, welded wire stretched between. Sherman, the fellow I hired to put the fence up, was raised on a farm and has built things his entire life; and though he's now in his 70s, he dug 20 post holes in a fraction of the time it took me to dig the remaining ten.
We set all 30 posts into the 24" deep holes, ensuring they were plumb as we filled the remainder of the holes with Quikrete. But getting water to each of the holes was going to be a challenge, as the house the fence is attached to has no hose connection. I could fill buckets at the other house on the property and carry them over to the post holes, but that would be a slog, particularly since the fence is built on hilly ground.
Sherman explained that we wouldn't be carrying buckets of water to each hole, nor buying a hose extension.
"But doesn't the concrete need water to set up?" I asked.
"Yes it does," he agreed.
"So how are we going to get the water to the holes?"
"Wait for it to rain," he said.
Two days later there was a thunderstorm, which handily filled each hole and mixed with the concrete. Afterwards Sherman checked the posts to see if they had shifted any, and tapped a few of them this way and that while the concrete was still wet. Then the posts set up, and now they're rock solid.
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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.
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! :-)