Erm, chemical paint remover (presuming the paint is oil based), brick cleaning acid, some types of graffiti remover et al!
A typical BFBI (brute force and bloody ignorance) 'suggestion' from the uninformed?
As above.
Very good description of the problem - perhaps letting us know what type of paint could help in formulating an answer!
Is masonary paint? Is it an oil based paint? Is it PEP (for the uninitiated Plastic Emulsion Paint)? Is it bitumen paint? Is it an acrylic paint? Is it a simple lime wash? Is it a combination of any of the above?
With the number you are talking about and the previous comments, I think this will be an expensive option. If the concrete is in good condition then a regular paint stripper for the bulk and Nitromors to remove the rest, maybe?
I did suggest using an angle grinder to cut the plywood a few threads ago - I thought that was entering into the spirit of things.
But I did misunderstand the OP, for some reason I thought he was proposing to mount the abrasive disc on the AG (silly of me), but I now see he meant just what I was suggesting.
I was using a wire brush and an abrasive disk in an AG two weeks ago to remove rust from some steel shelving... it ain't half noisy and very aggressive. I don't see what's wrong with a blow torch and scraper.
Wirey things usually - too rough for a flat sheet based disk.
Chemistry is often better and quicker though. Follow up with a good pressure washer can work too.
Much depends on why you're doing this: to strip flakey paint before repainting, or to clean off graffitti. It's really hard work to take paint off rough concrete, or concrete with exposed aggregate textrue, if you're aiming for clean concrete afterwards. I generally wouldn't even try - it'll be easier to prepare & repaint than to go back to a decent quality bare concrete.
Have you considered water-entrained sand blasting? It's much less messy (no dust, and safer) than dry blasting. Location might limit the possibilities. The Karcher pressure washer and attachment seems to work pretty well but a demonstration would be advisable.
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