Concrete pad question

Old 03-11-08, 12:49 AM
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Concrete pad question

I'm putting in two 2,500 gallon water tanks and will be pouring a slab for them to sit on. The tanks are 8 feet across and I want to set them about 8 or 10 feet apart, so am planning on a 12 x 24 foot pad at 4" deep. Will be putting in remesh and rebar and digging some footings (about the size of a 5 gallon bucket) near the corners and along the long sides.

We just poured a 12x12 slab and have a good feel for what it takes.. However, should I put an expansion joint in this slab? and if so, what do I use? Just a 2x6 board or is there something else that should be done?

Thank you in advance.
Old 03-11-08, 06:17 PM
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I doubt you need an expansion joint in the slab, better to form/cut a control joint in the middle. Carry your bar/wire through the joint and form/cut a joint at least a 1/3 as deep as the slab. The loading is less than 400 PSI so it isn't critical.
Old 03-11-08, 08:25 PM
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Concrete pad question

The "bucket sized" footings are a waste of time. A continuous thickened edge would be better, but you have already done what you think is best. - I assume frost is not a concern and the 20,000# tanks are bearing uniformly on the slab without ant support points.

I would keep the slabs for each tank separate from each other. You never know what will happen with one full and one empty, no matter how you plumb them.

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