Help! Grinding not going well

[AA7483]

I rented an Edco 10" grinder to prep my floor for epoxy. So far all its doing is gouging my floor Tried messing with the level control. Too much and it goughes. Too little and it doesnt do much. Any advice?

 

[LegacyIndustrial]

Pictures of unit you rented, pictures of diamond tools and the floor too?


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[AA7483]

I rented an edco 10 inch single disc grinder. The tool they gave me was a 20 segment griding disc. Left gouges in the floor. Took it back and got the diamabrush prep tool. Not gouging through floor anymore but seems like a very slow process. This is the bottom of the tool I had.

 

[AA7483]

This is the damage it was doing and this is the result I'm getting from the diamabrush.

 

[AA7483]

Do you think wet will be more effective?

 

[AA7483]

So I decided to try it wet. It's leaving a smooth look now. Minimal swirls. It's still wet here. It's not all white. Has blotchy dark spots. By comparison it feels rougher than the original power trowelled glass like finish.

 

[LegacyIndustrial]

That is a standard head and standard machine. This tool would only gouge SOFT concrete.

Did you have any issues with the pour?


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[AA7483]

No. Pour went fine. Maybe I had it set too deep? I made 4 passes with the diamabrush. You can def feel the difference between the glass like feel it had before and now. Maybe I should etch too to make certain?

 

[AA7483]

This is what it looks like this morning with the floor mostly dry. In some spots you can faintly see some specs of aggregate so I'm assuming it's deep enough. Rinsed out plenty of slurry with each pass. Doesn't feel super rough but maybe I'm over thinkng it. Was just concerned with the tightness of the floor from the power trowel. I'm going to etch as well. I tend to over do everything so why should this be any different.

 

[Cairo94507]

I just had my garage floor ground down to facilitate the installation of porcelain tile. The machine he used was called a "scarifier" (local equipment rental store) and it ground the floor and left a kind of rough finish on it, similar to when the city/county grinds residential sidewalks when they have "trip edges" sticking up. Then my floor guy used a self-leveler on the floor to reduce any low spots and fill the expansion joints. My floor is 40 years old BTW and stable. Then after the self-leveler he used a Schluter membrane that is rolled out and adhered to the floor with the same stuff he used to then install the porcelain tile. The result is a perfectly flat floor that looks terrific.