Grain bin concrete pad over old.

tjiniowa · Jul 5, 2012

I need to enlarge a 15 ft. diameter pad to fit an 18 ft. bin, the old concrete is 4 years old and in good shape.
Looking for recommendations if I can just add on to it at the same level all the way around, digging in a rat guard as well, and drilling in some rerod to the sides and a couple of bands around it. OR should I do that as well as add 4-6 inches on the top of the whole thing and tie it all together. Please don't tell me to remove the old one and start over, I know I don't need to do that, I am just wanting to place a 18ft. bin here to use for wet holding bin, it is in better shape and larger than the 15ft. I placed there used about 4 years ago. Thanks, I have to do all my concrete work myself because nobody good around here will do small jobs like this for me because I am not a big time farmer with deep pockets.

Kow Farmer · Jul 5, 2012

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

tjiniowa · Jul 5, 2012

Well, I can borrow the forms from a neighbor, and I have a hammer drill. I am thinking I should go overtop the old pad with 4-6 inches and like a grid of 2x2 ft rebar, with a stake drilled in at each intersection. Do you think that would be enough. I have access to bull float and stuff like that, and I got a buddy with a mini hoe that can dig a footing around, just a little sweat and it should work. Just wondering how much rebar I should use

fixerupper · Jul 5, 2012

The old crete has settled in but the new crete ring around it will settle. I'd go with Kow farmer's advice and re-rod the heck out of it, or you might end up with a floor that's high in the middle and low around the outside with a big wide circle crack at the edge of the old crete. Jim

dpendzic · Jul 5, 2012

I wouldn"t pour concrete over the old. #5 rebar at 2 ft on center dowled in should hold the new to the old.#5 bar needs to be embedded about 18 inches to develope its full strength--a concrete anchor and bolt might be easier. It would be great if you could cut out a shear key in the side of the old--we use to do this when extending a bridge footing. Be sure to use a bonding agent or at least coat the old concrete face with a wet mortar just before pouring the new concrete

Kow Farmer · Jul 5, 2012

Sounds like you are on the right track. Do you have a chop saw to cut rebar? Yes, get the bull float and a a hand mag (float) too. I don't know how much cement is a yard now days. If I were you I would try to get an idea based on your dimensions of the "new" slab to see how many yards of cement you will need. I don't know what your budget is, but just get an idea so you know roughly the cost so you do go into shock. LOL Sounds like you already have or have access to most everything you need. Well, best of luck.
Kow Farmer

willie in mn · Jul 5, 2012

Couple off the wall thoughts here, most likely just muddle the works rather than be helpful.
Do you need the extra capacity of the larger bin?
How long are the sections/panels? Would it work to pull the sections in to fit the 15 foot base? I have no idea how much the sections can flex. Each ring would have about 9 1/2 feet extra. Cut the excess off, & for the cost of a box of bolts, use the cut-offs to add another ring at the top? No concrete work.
Probably wouldn't work, just mind rumbling.
WJ

gene bender · Jul 5, 2012

What do the people you are getting the new bin tell you as they are in the business and know what you need. They would even have someone to do the job.

tjiniowa · Jul 5, 2012

I got bin from a neighbor. Concrete guys say they are to busy to pour bin pads and don't mess with little stuff. Being a small farmer I run into this all the time, not big enough, I guess. But maybe someday I will and I am going to remember all the guys (machinery dealers, chemical dealers, contractors, etc.) that didn't want to mess with me.

Anonymous-0 · Jul 6, 2012

I would go with pinning it to the old slab as you said, but also add two rings of rebar in the new ring all the way around to keep it from cracking. Be sure to tamp the base below the addition and soak the heck out of it to get it settled well before pouring.

JMHO

Areo

Grain bin concrete pad over old.

tjiniowa

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Kow Farmer

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tjiniowa

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fixerupper

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dpendzic

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Kow Farmer

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willie in mn

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gene bender

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tjiniowa

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Anonymous-0

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