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  • MarkR146 commented on mdheath's instructable Concrete and Wood Slab Table2 weeks ago
    Concrete and Wood Slab Table

    well done! beautiful piece of work. a suggestion on the expansion/contraction issue would be to not have the plank go all the way through both sides of the table. Then use epoxy on the backside of the plank that gets the concrete poured over it. This additional side of adhesion should control a lot more of the expansion/bowing that could occur.One caveat, since the concrete on the bottom is now only 1" thick in the area underneath the plank, you'll need to really increase the strength of your pour mixture and/or reinforcement. I recommend (and have used) specialty concrete fiber - this can be mixed into the entire pour, and doesn't show if/when you expose down to the aggregate. Alternately, once you pour 1 1/2" of concrete, lay a high strength sheet covering at least the ...see more »well done! beautiful piece of work. a suggestion on the expansion/contraction issue would be to not have the plank go all the way through both sides of the table. Then use epoxy on the backside of the plank that gets the concrete poured over it. This additional side of adhesion should control a lot more of the expansion/bowing that could occur.One caveat, since the concrete on the bottom is now only 1" thick in the area underneath the plank, you'll need to really increase the strength of your pour mixture and/or reinforcement. I recommend (and have used) specialty concrete fiber - this can be mixed into the entire pour, and doesn't show if/when you expose down to the aggregate. Alternately, once you pour 1 1/2" of concrete, lay a high strength sheet covering at least the whole extent of the plank

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