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O T Concrete question

Yes as long as the new pour is thick enough to support itself. You can pin the two together with rebar, and there are also bonding agents that will help.

Really we need more details to provide guidance.
 
I have seen it work and not work. The rougher the old concrete the better the new stuff will stick.

About fifteen years ago we had a concrete driveway poured at one of our rentals. The guy who did the work was a bit of a fly-by-night operator, but he was cheap so we took a chance. He had a contractor come in to tear out the old driveway with a front end loader/backhoe, which went well until they got to the slab right next to the house. That slab had to be ten inches thick, and as the contractor tried to lift it I could see the corner of the house moving! I stopped them and said we needed another plan. The fly-by-night concrete guy said he could pour over the old slab. He washed it up real good with a garden hose and poured a couple of inches of concrete over the old slab. I was dubious, but that slab has held up fairly well. We should have used one of the products available to improve adhesion, but it seems to have stuck good anyway.

Here's one of the products available to bond new concrete to old.
Sika Bonding Adhesive
 

They key, as moresmoke said, is that the new layer has to be strong enough, and like anything else it depends on the intended load. Foot traffic vs. loaded forklift etc.
 
Yes and no. You could pour new concrete over old concrete if it was thick enough. Then it would need to be where you wouldn't get water seep in between and freeze. In such a situation it would help if you would make the slab bigger and pour a footing around the parameter deeper than the old concrete. That should eliminate the freeze problem unless you live somewhere that has abnormally cold.
 
I agree with all the opinions posted. I know we did have a problem with the surface in the milkhouse sanding off shortly after it was poured. So we took some cement powder and mad a slurry like out of it and spread it on the top most of it stayed on and is still there today. That was back in the 70's so what 45 years about.
 
We are currently remodeling a building that was originally the city hall/ fire hall. Circa 1910. There is an overlay in the building that was found during removal for plumbing. They used wire mesh in the overlay and poured it at 2-1/2”. The floor was in good shape. It can and has been done.
 
I have done it many times, mostly on smaller projects with good results.

Clean everything up real good then mix a gallon of white wood glue with a half gallon of water, use a wide paint brush slop it all over the old concrete and work it in good just before you place the new stuff.
 
How big of an area are you doing and why do you need to put new concrete over old concrete? If it's a small area and the ground has settled where it isn't level you can pour a thin layer of level quick over the old concrete and it is self leveling.
 
Are you pouring the same area as the old concrete, or bigger?

Is the old concrete cracked?

Cracks or edges will show through on the new pretty quickly, and the new will have the same cracks as the old.

I’ve heard of a 2 inch layer of sand put over the old, then pour a new pad over that, the sand helps float the new concrete without the cracks coming right through.

If you want to refresh an old floor, there are some leveling products that might do better than just new concrete.

Really hard to say with so little info of what you have and where you are trying to go.

Paul
 
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