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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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