Getting ready to pour

[Mush07071]

Putting a slab in my Barn, I have a few questions.

It will be a 27 X 35' floor, Im pouring a 5" slab with rebar and wire screen
6" of crushed compacted clean stone, I will also have 6 mil plastic poly on the stone.

Here is an issue I have, there is a 10X 15 section that was done years ago, ITS THICK, the finish is broom, and the edges are a little rough, not too bad but not perfectly smooth, level but bumpy. I think the homeowner did this by hand.

I will be pouring right up to that edge, is there a good way to grind that down, it drops of the ledge now so a large machine will prob just slam me across the room..

Is there a floor covering that I could lay on top after that would just cover it and look good, I could go with that option..

 

[buzz4041]

You could always just pour a 2" cap to it and blend a slope down to your new slab. If not get a grinder with masonry disc and get after it. Hard work but can be done.

 

[7th Kahuna]

Another option perhaps would be to pour the new slab high then come back and pour a self leveling mix over the 10x15 section to bring it level. Not sure if that would work with your existing elevations or exactly how thick it would need to be. I have used that process to level floors in the past. The self leveling material was pretty thin. My other concern would be how clean you were able to get the existing surface and thus how good your adhesion.

 

[NUTTSGT]

A 10x15 section 5" thick, will be less than 2 1/2 yards. It might be well worth it to tear it out and forget about any future headaches of matching up concrete or needing a smooth pad where that is lumpy.


At $100/yd for concrete it'll cost less than 250 bucks to repour that section. How much is your time worth to try to match it up with the new ?

 

[dyork8]

Nuttsgt has it right - you're going to look at this forever and, in grand scheme of things this 10X15 section is not much. I would tear it out and replace it with the rest of the floor. My father is a 30+ yr cement mason and he always hated putting a 2" topping on anything as it may not "stick" or has a greater risk of cracking and releasing down the road.