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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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