Slab Patch Failure

 
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Old 08-12-2017, 03:09 PM   #1
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Slab Patch Failure


The contractor who did this said they used hydraulic cement patch.
Raved about it.

But I don't think they did anything as far as reinforcement -- the patch is about 8 to 9 inches across and the front center of the pocket door rests on (metal 'U' brace) in addition to being fixed at a right angle wall from behind (4 to 5 inches back). Formerly it was a pvc vent pipe that was relocated. This patch was let to dry/cure for more than 2 mo's before started doing this...

What does this look like - too rich a mix? No structural reinforcement below? No wetting of the concrete edge to encourage a bond at the perimeter?

What might be a recommended repair method? As it is, I cannot lay our tile, will surely crack out.
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Last edited by artinall; 08-12-2017 at 05:21 PM.
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Old 08-12-2017, 04:41 PM   #2
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Re: Slab Patch Failure


In my world we would square up those edges, square up the sides, make certain ALL loose material is removed from the patch area.

The patching material you are going to use will determine the next steps.

You may have to fool with depth and provide a bonding agent.

Why did yours fail????

wrong material, too much water, not clean, improper prep etc....

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Old 08-12-2017, 11:36 PM   #3
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Re: Slab Patch Failure


I would do something along the lines of what Griz said and then put an anti fracture membrame of some sort over the concrete in that area. As long as there isn't any differential settlement I would think you'd be good to go, stressing the word think.
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Old 08-13-2017, 07:47 AM   #4
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Re: Slab Patch Failure


Quote:
Originally Posted by Rio View Post
I would do something along the lines of what Griz said and then put an anti fracture membrame of some sort over the concrete in that area. As long as there isn't any differential settlement I would think you'd be good to go, stressing the word think.
Anti fracture membrane? If under that door, then not only the pocket door but that wall would have to be reframed.

Already I planned on putting ditra down for the tile. This can't fail, if it were to then the entire ditra layer might have to be pulled, which floats in a layer as I understand it, which means everything in this small bath?

Might that pocket door have to be yanked, to get an even repair?

Last edited by artinall; 08-13-2017 at 07:49 AM.
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Old 08-13-2017, 09:32 AM   #5
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Re: Slab Patch Failure


Hydraulic cement is not really a good product for patch work like that, great for plugging holes and small cracks, not so much in lager areas.

I would have used a simple high strength bag mix and maybe a little bonding agent.

But like Griz mentioned the perimeter needs to be cleaned up.

Tear that patch out and clean cut the sides, square up the hole. 5,000 psi sakrete mixed tight and you should be good to go.
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Old 08-13-2017, 10:47 AM   #6
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Re: Slab Patch Failure


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Hydraulic cement is not really a good product for patch work like that, great for plugging holes and small cracks, not so much in lager areas.

I would have used a simple high strength bag mix and maybe a little bonding agent.

But like Griz mentioned the perimeter needs to be cleaned up.

Tear that patch out and clean cut the sides, square up the hole. 5,000 psi sakrete mixed tight and you should be good to go.
What would you use to square sides on this smaller hole, with the wall obstruction?
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Old 08-13-2017, 10:59 AM   #7
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Re: Slab Patch Failure


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What would you use to square sides on this smaller hole, with the wall obstruction?
Roto Hammer and a 4" grinder.

We do it all the time.
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Old 08-13-2017, 04:52 PM   #8
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Re: Slab Patch Failure


Looks like they broke it out with a sledge hammer and patched right over the rough edges

Cut it out with a demo saw and rep our it with 4-5000psi bag mix


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