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Tool Talk Discussion Forum

Cracks in concrete slab

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Mac in Ontario

01-08-2005 21:32:53




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Here's my question - I had an outdoor slab poured, put a shed on it. The slab is 20'x32' , the shed is 20'x12'. The slab is 4" thick except under the walls, where it's about 12" thick. It was all done in one pour. Where the slab thickens, there's a hairline crack outside of the building, running parallel to the wall. Slab has control joints - should have had one where the slab thickened. The concrete is fibermesh with no rebar.
The ground gets frost in it here - water in the crack will freeze, likely to make things look worse in the future. Can anything be done to patch/seal up the cracks ?

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Mac in Ontario

01-10-2005 17:48:46




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 Re: Cracks in concrete slab in reply to Mac in Ontario, 01-08-2005 21:32:53  
Live and learn ..... ... Thanks all



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David Mcadams

01-09-2005 08:47:00




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 Re: Cracks in concrete slab in reply to Mac in Ontario, 01-08-2005 21:32:53  
I would never pour concrete without steel in it either rebar or mesh but that doesn't help you now. They make several types of concrete seal some is of epoxy that may keep the water out. Problem is more than likely frost is going to cause that crack to re-open or get bigger every year or two. So you will probably have to keep re-applying the seal. Also I never put an expansion joint where the concrete thickens just use steel and wire it in good. There is a thread back a few days ago that I explained how I pour slabs that maybe of some help in the future.

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MAC,IL

01-09-2005 08:42:16




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 Re: Cracks in concrete slab in reply to Mac in Ontario, 01-08-2005 21:32:53  
Seems I read someplace to use hydraulic cement to fill the cracks.



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Jimmy King

01-09-2005 04:57:01




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 Re: Cracks in concrete slab in reply to Mac in Ontario, 01-08-2005 21:32:53  
Years ago an old concrete man told me there are two kinds of concrete that which is cracked, and that which is going to crack. Could you use a concrete saw to make a control joint there?



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Mark - IN.

01-09-2005 07:53:38




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 Re: Cracks in concrete slab in reply to Jimmy King, 01-09-2005 04:57:01  
A friend told me something similar about scooters - There are two kinds of bikers, those that have gone down, and those that will go down.

Some guys at the track told me about some stuff that they pour over there concrete slabs after they put their buildings up. They do it to level out any dips for carpet and flooring in the concrete and say works great for sealing and filling in hairline cracks. Haven't heard what it is yet, but when warms up plan to do it it my tool shed - I poured the concrete, and has dips big enough to swim in. Figure oughta be ok for that. Also for cracks can use hydraulic cement.

And I've gone down on the Hog more than once. The trick is to cut the wheel and walk her backwards to get her back up after limping off the scraped up leather.

Mark.

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Skinner

01-09-2005 16:01:07




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 Re: Cracks in concrete slab in reply to Mark - IN., 01-09-2005 07:53:38  
If you grab that hog by the ears and twist real hard she will get up on her own!!

I dropped my E-Glide on a road with was about 6" of loose sand. Was being to careful and the front wheel plowed on me.

LOL
RIchard



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Gary in TX

01-09-2005 06:35:33




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 Re: Cracks in concrete slab in reply to Jimmy King, 01-09-2005 04:57:01  
I have a shop floor that was poured in 1988 that has not cracked. Had rebar placed 18" on centers both ways and of course the footings around the edge and a footing through the center both ways. Personally a slab without rebar seems to me to be a mistake.



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No reserved name

01-09-2005 05:40:02




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 Re: Cracks in concrete slab in reply to Jimmy King, 01-09-2005 04:57:01  
Or there is two guarantees with concrete.
It will get hard and crack.
Go to a supplyer where they supply the contractors and they will have the good stuff.



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Dave NE IOWA

01-08-2005 21:46:06




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 Re: Cracks in concrete slab in reply to Mac in Ontario, 01-08-2005 21:32:53  
To late now to put in rebar of course, so all you can do is keep the crack filled with pure cement and water. This problem will probably return. Uniform fill and thickness is usually a good idea, otherwise a very gradual increase in thickness. For filling crack -- some feel a calk is better perhaps so it can expand and contract and still stay sealed. If you chose calk and the crack is deep and wide you can use a rope like filler made of foam, then calk the top inch or so. Tar can be used, but kind of messy. Good luck Dave NE IOWA

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txblu

01-09-2005 03:24:26




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 Re: Cracks in concrete slab in reply to Dave NE IOWA, 01-08-2005 21:46:06  
Someone makes a silicon crack sealer. I see it in industrial locations where they seal expansion joints in sidewalks. What I see is gray in color. GE silicones or someone like that should be the place.

Might just crank up the www. Google search engine and go a lookin.

Mark



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500sks

01-10-2005 04:49:42




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 Re: Cracks in concrete slab in reply to txblu, 01-09-2005 03:24:26  
If you want a good joint sealer SL-1 is very good you will get it at your local concrete supply house.



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