Recycled used Blue Stone - Removing concrete from previoulsy used bluestone


Old 09-17-13, 11:57 AM
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Question Recycled used Blue Stone - Removing concrete from previoulsy used bluestone

I've acquired some very nice used blue stone treads (12'' x 2" x 2' - 6') and some blue stone squares (2' x 2' x 2").

Unfortunately, the treads have concrete on them (they edged a swimming pool). The concrete covers pretty much all of the underside of each tread and is generally half of an inch thick, though in some spot it can be as deep as two inches. I want to use the treads to edge a poolside brick patio. Ideally, I would like to set the treads in concrete.

To do this do I need to remove the concrete from the treads? If so how do I do this (air compressor chisel I suppose) and roughly how long would it take to remove a quarter inch layer of concrete off a 12" x 48" tread with an air chisel?

Alternatively, can I set the treads with the concrete still on them in a new bed of concrete? If so what would I have to do to the existing concrete on the treads to secure a good bond with the newly laid concrete?

Another option I can think of is try laying the treads (in sand on top of compressed gravel/stone) next to the bricks that make up the patio and concreting the sides of blue stone treads to keep the treads in place. I just wonder if, over time, the treads would shift or sink. Any thoughts?

The same questions arise for used the concrete squares I have.
Do I need to get any concrete off them before laying them in newly laid concrete. How should I clean them before laying them in concrete?

I thank everyone for their suggestions in advance. I very much appreciate them.

Have a great day.
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Old 09-17-13, 12:28 PM
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I would try to chisel off as much of the old mortar as possible. Then if you have residue left on the stone it can be removed with muratic acid which will dissolve the cement in the mortar. Make sure you read up on working with muratic acid as it's extremely powerful in it's undiluted form from the bottle.
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