Rabbeting concrete

Question

I am estimating an approach in which I'd make a rabbet on a soft concrete wall. The dimension of the rabbet are roughly ~2cm x 3cm x 400cm.
My initial idea is to find a router bit (wood router) for concrete and use that.
Conceptually this sounds fairly simple, but have found close to none results when searching.
Is rabbeting concrete a plausible approach and if not what are the difficulties?

Jasen · Answer

Use the a wall chaser, this is a tool electricians and plumbers use to cut chases (small trenches) in concrete, but fit only one blade (use a washer in place of the other(s)) do one cut from the top and one from the side.

Solar Mike · Answer

Use a masonry saw much like a chain saw but with a large disk instead of the bar.
Then make 2 cuts 1 horizontal and one vertical.
You will need to use a rail or guide to cut straight lines.

Rabbeting concrete

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