This is a tough one. I was contemplating on responding, but I thought, what the heck. I used to do masonry for farm construction years ago. I only poured 2 round bin slabs though. My boss didn't want to buy the round forms to pour bin slabs. Anyway, I guess if you are doing the concrete work yourself, I would drill 1/2" holes for rebar pegs the whole circumference around the old slab to tie into the extra new 3' radius and tie in full pcs. of rebar around onto these pegs. How thick is the 4 year old floor? If you pour over the old floor, I would also drill 1/2" rebar pegs in the old floor and tie rebar into 2' x 2' square grids for floor strength. I know that is a lot of drilling and tying rebar, but I learned to use a lot of rebar. Less chances of the floor cracking or separating. I know this will be a lot of work on our part, assuming you have all the tools you need to add on this slab. I hope this makes any sense to you. Just my .02 worth. Best of luck to you also. Kow Farmer
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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