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Cement floors can seem difficult to tackle when they've been damaged, but it actually isn't that tough to take on. These DIYers give great advice on how to patch up concrete garage or basement flooring when it has been chipped or cracked.
Does someone know how to properly patch such holes? What kind of surface is that?
Highlights from the Thread
Some of the concrete experts should be along soon. My answer would be to saw cut the section & fill it with a concrete mix.
GregH Super Moderator
We have available a concrete based patching material called Top and Bond.
It works well and can fill thin voids.
You may be able to find a similar product where you are.
For me, it seems like the surface is made by some different material. It's smooth and shiny, cracking everywhere and chipping on a few spots. How can I patch it smooth, not rough concrete-patch compounds.
That floor has a clear concrete sealer that was applied AFTER the concrete had hardened for several weeks. You would have to apply a similar sealer after the patch has hardened.
marksr Forum Topic Moderator
How slick the finish is depends on how the cement was applied. If you just pour it out and leave it - it will be rough, but working it with a trowel will give a slicker finish.
Just a thought, but it looks to me like the original surface was worked a bit too much. As you trowel and trowel the surface, you push the larger stones (the aggregate) further down and bring the cement, water, and finer materials to the surface. This is how they get a smooth surface out of a concrete mix that is full of stones. But, if they work it too much, the surface is all fines and water not as durable.
I'm sure the concrete pros can clean up (or throw out) what I'm trying to say.
As Bud said, the pictures show what appears to be surface failure caused by overworking and/or too high a water-cement ratio. A simple patch job will do nothing to improve things, as there's just too much unsound and debonded concrete to (economically) repair. All of the questionable material should be removed and completely replaced, full-depth, with a new slab. A less extensive (and less expensive) alternative would be a thin-bonded concrete overlay, performed by someone familiar with the process.