Posted by MarkB_MI on September 16, 2020 at 03:27:42 from (174.245.19.118):
In Reply to: O T Concrete question posted by ghunziker on September 15, 2020 at 19:15:37:
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.
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