I had to cut my sloping concrete driveway in order to replace my water service mainline. I went from galvanized to copper for the water service. Now, I'm left with an open trench 12" wide by 6" deep by 17' in length. What would be the proper patching material for this repair? Rebar necessary? Any help/advice is greatly appreciated!
Being as you are in LA you probably don't need permits for this. The present slab was probably not on any sort of base material either, you can probably just pour new conc. on the bare earth.
It'll never look good but you could drill 1/2" holes into the ends of the slab and install #3 rebar, staggered 24" O.C. Then pour the new conc.
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The patching material would be plain concrete. Make sure that the fill around the new pipe is well compacted, or it will crack. Using rebar sideways, like Andy suggested, will help to keep your new concrete from sagging and busting your new pipe.
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