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Tool Talk Discussion Forum

Re: Concrete cracks

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Billy NY

07-26-2014 10:06:22
66.67.105.23



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Not likely, must have shrunk and separated, could be several issues to consider, reinforcing, the material itself, the weather when it was placed, hard to say, but once its fractured, even finely, you may be able to seal it with something elastomeric, at the joint of the crack there are sealants/caulking for this, but any coating, with expansion or contracting, the crack is likely to project through, sooner or later. Typically, if none of the above is an issue, relief or control cuts are placed, you don't have this problem on a slab of that size, placed at one time.

There are coatings, but they need to bond and be elastomeric enough to expand and contract with the slab, and most are not, there may be another underlying cause, excess shrinkage, not enough or correct reinforcing, did they place rebar, 6"x6" woven wire mesh, was the material good, what kind of mix design, how about the weather and hydration, (curing) all these can play a role in this.

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Paul

07-26-2014 11:52:43
76.77.203.247



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 Re: Concrete cracks in reply to Billy NY, 07-26-2014 10:06:22  
Usually comes down to a well packed proper base.

Rebar will keep the crack from moving up or down or very wide.

Mesh will help a short time, but often gets mushed to the bottom of the concrete so not very effective, and rusts through when exposed on a crack in my winter de-icing climate anyhow.

You can pour some elastic sealer in a crack after it opens up, but not anything for a new crack as you say.

Paul

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Ian Beale

07-27-2014 17:24:18
123.211.111.164



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 Re: Concrete cracks in reply to Paul, 07-26-2014 11:52:43  
We use a product here in OZ called Mr Crystal to repair leaks in concrete tanks and troughs

http://crystalfix.com.au/content/how-mr-crystal-works.html

Basically you make a slurry and paint it over the crack and the product wicks in and forms crystals, stopping the leak and protecting the reo. If the tank is moving under load they tell you how to reinforce it with 2 rings of re-bar to stop the movement. One of our tanks has gone from leaking enough to bog a cow beside the tank to minor seeps, which I hope to beat eventually.

Now this is not a slab repair, but a BIL is a professional concreter, and they use a similar product to deal with surface cracks in slabs

http://www.xypex.com.au/

For what it is worth

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