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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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