cement is slanting towards the back of my steps and I want to raise it enough to either level it out or slant it away from the house because rainwater is leaking into the basement.Too hard for me to break up the old stuff, as I*m not physically able to do that.
you may want to use a concrete patch material to level out the existing concrete or you might get someone to cut drain ridges in the existing concrete with a concrete saw.
I poured new concrete over my old porch and sidewalks old and its held up for 6 years now. I did ruff up the surface of the porch but not the sidewalks. They sell a primer now for doing that. As long as the new concrete isn't to thin, you should be fine. If you just need a thin surface, Home Depot sells self leveling concrete and floor leveler. It is made by Henry, is in a 40lb bag in the tile dept.
The problem with putting new concrete over old is that it will not stick well unless you break up much of what you have - almost to the degree that it is a new job. If the old concrete has settled and caused the slant, it may not be completely done sinking and you may have to remove what you have and get a good base foundation and pour concrete up from there. It may be a major job no matter how you look at it.
Your second application of cement should be at least 2 thick to avoid spauling.
