How to smooth rough concrete

Some years ago my basement floor was cut up to install new sewer pipes and the knuckleheads that re-poured the concrete did not put a smooth finish on it. I would like to paint the floor but those areas where the new pipes are are very rough.

Is there any way to smooth those areas? I've read other places in these forums something about grinding?

Thanks!

 

I don't know if the equipment is available to average citizen but, yes, there is a procedure for grinding and even subsequent levels of finer abrasives that are considered polishing.

I have seen floors that shined even before any wax was applied.

How large of area do you need to smooth?

 

The area in question is about 12" wide by about 50 feet long.

 

that's quite a large area. I was thinking of ways to do this with less than the big machines but with that much it would be a pain.

I was also hoping one of the concrete guys would see this (don't give up hope yet, they are around somewhere) and give some direction.

at this point, my best advice would be to either call a contractor that deals in concrete grinding or check around to rental businesses to see if any of them do rent a concrete grinder.

I don't know how small of a machine would be available but the ones I have seen are quite large and cumbersome. Maybe the rental shops can help you out.

keep checking back for the concrete guys to add some advice.

 

Anyone, please?

Surely there is a way I can do this.

 

they make concrete sanding/grinding disks for angle grinders and power drills. Local hardware store should have them. 50 feet is a long way, but 12 wide isn't so bad.
there will be a lot of dust so use a mask.
You could also chisel it out some, and put new concrete in and smooth it.

 

what I would do is snap a chalk line 2 inches from the each side of it. Then rent a demo saw and cut that out. and pour new concrete and smooth it out

 

some apron stores have rental shops featuring sawtec diamond grinders w/dust shrouds that hook up to your wet/dry vac but that method's only good for taking off the high spots.

ck w/any const supply house ( NOT an apron store ) for a polymer-modified cementitious repair mortar,,, read AND follow the directions - should not be a problem other'n the color'll be different.

using ANY paint on a conc floor's useless imn-s-hfo as you've found, plumbers are not conc masons