Concrete tabletop question
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Couldn't you use ultra light cement In a form?
You can make a form the size you need the table top to be. Seal the frame so no cement leaks out. Get a piece of flat foam sheet. Cut it 1/2" smaller than the frame. Drill holes of 1/2" diameter every 4-5" apart . Make sure that the foam is only a third as thick as the finished product. Pour half of the cement into the mold vibrate the cement into the corners. Before the cement starts to setup add the foam. Rocking it into place. Be sure when you add the rest of the cement to fill all the holes in the foam and have at least 1/2" to 3/4"s of cement on the top. That way it will be a 1/3 less weight . You could also use corigated cardboard to fill in some of the mold.
Hi John, Here's a how to video. He's making a coffee table, but the principle is the same! https://www.youtube.com/watch?v=BygJGz3TC3o
Good luck!
Here's an idea for a lightweight table http://www.finehomebuilding.com/2013/03/08/video-series-how-to-create-a-lightweight-concrete-countertop
I did some calculations and the dining tabletop I am thinking of doing would be between 200 to 250 pounds even using a foam core and lighter weight concrete. I think I have found an alternative process (https://www.hometalk.com/diy/bathroom/vanities/diy-concrete-countertop-28896411) that I will give a try (come spring). I will keep this question open, should someone have an idea/opinion and I want to thank everyone for their input.
DIY Concrete Countertop!