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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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