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Tool Talk Discussion Forum

OT Concrete Slab

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Sam MI

06-21-2004 04:58:06




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Going to pour a 16' x 20' slab later this summer. I intend to use a sealer on the slab after it cures for several days. My question is; Will the sealed concrete cause any negatives as I intend to lay up concrete blocks next year as a base for a 10' x 16' utility building. Will the motar bond to the sealed concrete?




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Jon C

06-22-2004 08:51:23




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 Re: OT Concrete Slab in reply to Sam MI, 06-21-2004 04:58:06  
You may want to cut in a couple of control joints to keep the slab cracking straight, instead of random. The cut should be 1/4 of the depth and made within a day of the pour.



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MarkB

06-21-2004 19:54:06




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 Re: OT Concrete Slab in reply to Sam MI, 06-21-2004 04:58:06  
Sam,

Fresh concrete will not stick very well to sealed concrete.

It's not clear to me what you're trying to do. Are you saying you want to put a row or two of cinder blocks on top of your slab? If you're in Michigan, you really need footings that go down at least 42 inches below the surface If you don't do that, adhesion of the mortar to the slab is the least of your problems.



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EngineerJoyce

06-21-2004 12:15:34




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 Re: OT Concrete Slab in reply to Sam MI, 06-21-2004 04:58:06  
Concrete must cure and dry slowly. You will either need to mist spray it daily to maintain moisture for at least 2 weeks, or apply a curing compound to the surface as soon as it is walk-able. The moisture can be maintained by covering with straw / mulch and keeping the straw moist.

If the concrete dries out too quickly, it will crumble in a few short years. If it is kept moist and at a moderate temp, it will cure slowly and get stronger as it ages (As Hoover Dam has done).

Sealer: I seem to remember hearing something about "washing" the concrete surface to be bonded to with an acid before attaching new concrete to old (old = cured). Ask your local Concrete plant. Enjoy.

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Dean Minnesota

06-27-2004 10:16:46




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 Re: Re: OT Concrete Slab in reply to EngineerJoyce, 06-21-2004 12:15:34  
Also get the concrete into the forms as soon as possible and finished. We reject most of the concrete that comes from the plant over an hour old, with all of the traffic jams, it happens sometimes.



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txblu

06-23-2004 09:42:08




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 Re: Re: OT Concrete Slab in reply to EngineerJoyce, 06-21-2004 12:15:34  
Nice to hear from you again Engineer Joyce.


Mark



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Ron

06-21-2004 05:03:03




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 Re: OT Concrete Slab in reply to Sam MI, 06-21-2004 04:58:06  
The general rule is to let concrete cure for 30 days before you seal it. The sealer will have instructions that may vary.

For such a small slab I'd put a tarp over it until I was ready to build walls.



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