Floor grinding

[Reit38]

Had a few guys over last week to pour my shop floor. None of us have ever finished but figured we could give it a shot. We poured a bit to dry since we had a vapor barrier down and it got away from us setting up. Any way I could fix these drag marks from the float? I didn't know if I went over the while thing with a floor grinder would blend things in better. None if them are deep by no means but enough to be a eye sore

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[LegacyIndustrial]

You can grind these out but you will want to coat the floor afterward.
Get a good walk-behind diamond grinder with 30 grit diamonds.

 

[Reit38]

Would i want to grind the entire floor with the grinder or just the areas around the bad spots

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[LegacyIndustrial]

Would i want to grind the entire floor with the grinder or just the areas around the bad spots

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Honestly, that floor looks like it's powder on top. I would grind the entire thing.
Prime it and then apply an epoxy.

Be prepared for a dust-storm. Get a vac and put a dust-deputy in between the grinder and the vac.

 

[Armorpoxy]

Heavy grinding with a good grinder on the entire floor is recommended. Use a low # diamond #25 or lower. Then coat with epoxy system, make sure to use a primer on this.

 

[DC73]

You could use an angle grinder with a diamond blade to knock down any high spots and then fill the low spots with something like Ardex Feather Finish. But, this product is not designed to be wear layer. It's designed to be covered up.

I had a discussion about this a few weeks ago with a local flooring supply house. They mentioned Ardex does make an industrial grade product similar to Feather Finish that will work as a wear layer. I would contact Ardex technical support and inquire about that product.

You very well may need to grind the entire floor as has been suggested, but I'd give this approach a shot first.

DC

 

[LegacyIndustrial]

If you try adding a layer over that slab without grinding it, the weak concrete layer will pulverize over time, eventually letting the overlay release.

Grind it well, then you can patch low spots if desired.


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[Armorpoxy]

A note of caution that if patching and feathering where the patches feather out they are prone to failure as there just isn't enough material where thin to do much and from temp swings it can fail, taking the coating up with it. Best to grind it somewhat and then do an epoxy system with full fleck broadcast since this hides a lot of ills in the floor.

 

[The Tool Tyrant]

Wow...what were you thinking? "None of us have ever finished, but figured we could give it a shot" As you now know, finishing concrete is not like trying to paint a car for the first time...no second chances. Sorry it ended badly for you and hope you can get corrected without too much hassle. I got'a give you props for giving it a shot...but damn.

 

[gjuk]

Does not look that bad imho - I think the photos are focusing on the major issues close up. It's not like it is cracked to hell.