Step 2: 2. Pour Concrete
Mix and pour the ready-mix concrete.
We used a full 60lb. bag of basic post concrete mix since we had that on hand. It worked ok, but cracked because the form was too thin (specs state minimum of 2" thick). The trick to a smooth final finish to knock all of the air bubbles out. We tamped everything well with a small stick. Then we beat on the outside of the form with a hammer. You will see the bubbles rise to the surface. Let sit for at least 24 hours. (we rushed it and cracked the main bowl. as an easy fix, we glued the pieces to plywood with liquid nailsback in business)
We used a full 60lb. bag of basic post concrete mix since we had that on hand. It worked ok, but cracked because the form was too thin (specs state minimum of 2" thick). The trick to a smooth final finish to knock all of the air bubbles out. We tamped everything well with a small stick. Then we beat on the outside of the form with a hammer. You will see the bubbles rise to the surface. Let sit for at least 24 hours. (we rushed it and cracked the main bowl. as an easy fix, we glued the pieces to plywood with liquid nailsback in business)
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Sakrete
says:
Mar 18, 2011. 10:30 AMReply
Excellent Instructable. Great choice of Concrete :)
baramunchies
says:
Mar 24, 2009. 6:41 AMReply
some steel reinforcement would have helped, but i guess you know that by now.
1
Alex McCown
in reply to Jun 14, 2009. 11:51 AMReply
yah concrete is strong ... vertically ... week horizontally with out rebar
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