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There are specialist products for such 'full depth' concrete repairs, but they rely upon removing the rust from the rebar and application of zinc-rich paint to reduce further rusting.
In all probability the remaining concrete is essentially porous to both moisture and CO2.
How long are you staying in the property?
mespilus
My concrete fence posts are falling apart, are there any products I can use to patch them up?
I was going to try pva'ing them and putting some sand/cement in but I think it would fall out?
Pics not uploading, the concrete has blown all the way back to the rusting steel rebar.