How to fix this minor concrete floor problem?

[longez]

What's the best way to fix this on my garage floor? it looks like the builder might have fixed this before we moved in, but maybe his repair has failed? 1/4-20 wing nut for scale. Thanks in advance!

 

[alcorelli]

Looks like acid etching or strong caustic etching.

Grind out and patch?

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[Dumber than lumber]

I would mix up a little JB Weld. (Use my wife’s credit card to spread it flat and smooth.)

 

[Farmall450]

If you get it good and clean, Sakrete and others make a filler compound that you can nicely trowel in.

 

[rburke65]

Try posting this in the floor section.

 

[chargermann]

...grind out loose debris, clean, prep (primer and/or bonding agent) and patch with a high-quality exterior concrete leveling product. Just repaired several areas of my shop similar to this before the epoxy floor finish. Came out great, and the leveler is hard as a diamond.

 

[NUTTSGT]

Try posting this in the floor section.

I have moved it the Flooring Section.

 

[ConCretin]

Not to be unduly alarmist but that looks like de-lamination. Before you repair what you can see, drag a chain around the area in question. If you hear a distinct change in tone it indicates additional de-lamination. You could also tap on the edges with a hammer to see if the adjacent surface comes up.

De-lamination occurs when the concrete surface is sealed up by steel troweling before bleed water rises. The water literally pools under the surface creating a void. Since the concrete surface is separated from the underlying concrete, it breaks loose easily.

Hopefully I'm wrong or it's a localized problem. If the slab doesn't get heavy use, the de-laminated surface might stay put and you can patch the bad area with a product such as Ardex. If you ever consider an expensive floor covering such as epoxy, you'll want to make sure your slab surface is sound or it might all come up.

 

[Tpsykes]

X2 with llwillysfan

 

[LegacyIndustrial]

Hopefully not a "butter job" but looks like it.

 

[BillK]

What's the best way to fix this on my garage floor? it looks like the builder might have fixed this before we moved in, but maybe his repair has failed?

I have to agree with the others. Also I dont think all of those small spiderweb cracks are normal. I dont know how old your house is but if it is new I would get the builder out there asap and document the problem with them. Take lots of pictures. I am betting the rest of the floor is going to do the same thing Hope I am wrong.

 

[FJ4FUN]

How old is the floor?