Re: CRAPPY concrete job, fixable? (long) - Posted by PatrickMD
Posted by PatrickMD on June 18, 2000 at 22:22:21:
Jeff, I was a state highway concrete inspector for quite a few years. Where consecutive days’ concrete pours meet is called a cold joint. There has to be a compressible material between the two surfaces (like the black soft line every so often in a sidewalk) to absorb movement due to thermal expansion and contraction. I’ve never seen a horizontal layer system on concrete. Even if you can avoid a law suit by negotiating a rebate, they’re never going to be happy with it and will slander your good name at every chance they get.
If you’re going to go ahead with the magic leveler, you might want to try to make a model test bed first before you invest any more money. You’d make a small square of wood whatever size your local landfill will let you dispose of cheaply, say 2’x2’. Make a wood frame the thickness of a 1" bed of gravel plus the concrete and the leveler. Then, on an out-of-the-way piece of level ground, place the frame on a slightly larger piece of heavy plastic. Place 1" of gravel in the frame. Pour the concrete floor thickness on the gravel. (Careful, less water is better. Too much water wrecks concrete!) Let it set 3 days. Then add the leveler and let it set per the directions. What you’ll be looking for are any signs of separation, cracking, shrinking or expanding of the different materials at different rates. It may take a couple weeks to see conclusive results. I’m not sure how much time you’ve got. I also can’t say if this model will really show what you need to know - that is, will it work? It’s good customer service to admit mistakes and then fix them. I’d pull it out, have it done right and consider it a lesson learned. Good luck.