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 - Fabricating Sidesheets - by Chris Pratt. The easiest and best first-time project for wanna-be sheet-metal workers like myself is flat or nearly flat metal cut and drilled to be a tractor's sidesheet. A sidesheet is sheetmetal to cover either the engine as in the case of early Oliver's, Massey-Harris' and many crawlers or the wiring and electrical components as in the case of the Massey-Harris Pony, Allis Chalmers' D Series (D-14, D-15, D-12, D-10, D-17, and D-19). The need for fabricating becomes obvious when you go to buy any of these
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