Concrete without sand, or without gravel, is not very good.
Gravel must be clean, and the sand must be clean.
Lot's of good looking sand has enough clay in it to make the concrete weak. Put a half a shovel in a bucket of water and you'll see how clean it is.
The dryer you mix it the stronger it will be. I proved that to myself in a college class, mixing my own then breaking it with a calibrated load tester. Dry always wins. Mix it as dry as you can still get it to work into your forms.
For posts and pole barns I usually put dry mix in (no water added). Tamp it in and in 30 days it will be plenty hard from ground moisture. Saves hauling water out to a fence job.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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