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"  Anyone building with concrete should keep in mind these two facts: One, it will probably be around forever (think Roman aqueducts), because two, it&amp;#039;s awfully hard to get rid of (think pneumatic hammers, backhoes and hard hats). Making it, though, is easy. Mix one part portland cement, two parts sand and two parts gravel. Add enough water to make a mix that&amp;#039;s about the consistency of stiff mashed potatoes. Better yet, you can have it delivered to your house by a ready-mix truck\u2014the way to go for big projects. Concrete is sold by the cubic yard.  Safety  Wet concrete is strongly alkaline and can start a chemical burn if it contacts bare skin. Wear a long-sleeve shirt, long pants and gloves when working with concrete, and don rubber boots when you have to walk in it. Plus, don&amp;#039;t forget goggles to shield your eyes from airborne cement dust. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/home/outdoor-projects/how-to/a5542/4328767/>