Pole Building

[neutron]

Pole Building

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Hey guys, I have a 24 x 40 pole building/garage going up and am preparing to pour the slab. Any suggestions on rebar placement. Slab will be 4.5 inches thick with control/contraction joints 10 to 12 feet a part, using 4000 psi with air. Thanks.

 

[64dragnwagon]

My concrete guy that poured mine said that most non commercial pours he does they just order concrete with fiber in it. I went with wire mesh, 4,000 psi and he did not like the wire mesh. He said it has a pain in the *** to pour on and didn't do much good. I disagree, I poured my garage the same way 13 yrs ago and don't have so much as a hairline crack in it. As far as rebar just make sure you don't put it where a lift is going to go because you won't be able to drill through it to anchor the bolts.

 

[neutron]

Hey thanks for the reply, I don't like wire mesh either. I've used it on several other pours and find its effectiveness questionable. Its useless unless the place and finish crew pulls it up into the concrete. Fiber doesn't do much for you either according to ACI. I put fiber in a large hot tub patio and I think it helped minimize skrinkage cracks but I hate to lay on it. It makes me itch something awful. #4 bar is the trick with low water content. I like to add 5% air entrainment (in my location its required by the code and makes low water mixes more workable). I'll likely go with rebar on 4-foot centers if nobody else chimes in. Was hoping to get an engineer's opinion on it before I ran out and spent more on steel and plastic chairs.

Jim

 

[neutron]

Hey nice building by the way.

 

[razorbackchris]

Residential driveways are typically poured here (dallas area) with #3's on 18" centers. That is the spacing I would use. You could also use #4's on 24" centers but with the thickness you are proposing I would use #3's.

 

[Galaxie]

Fiber and no rebar here. Top was finished with a wheel and there are no fibers sticking up anywhere.

 

[neutron]

Thanks guys.

 

[Justanoldguy]

Fiber and no rebar here. Top was finished with a wheel and there are no fibers sticking up anywhere.

what's a wheel?

 

[Nighttrain]

See what local codes are. Here in Tx most are in the 16" 24" oc range that I have seen. Even the flat work (driveways, walks)

 

[Leadfoot3232]

my 30 x 50 was poured with #4 on 24" centers..almost a year now with no cracks whatsoever..