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SilverBee 05-01-2012 07:05 AM

Dissolving Old Concrete
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I am a bonsai artist. Recently, I discovered a real treasure at an estate sale--a set of three bonsai pots. One of them had been filled with concrete and large pebbles to make it a heavy base for artificial trees. I want to remove the concrete. The pot is of fired clay with fired glaze. The inside, where the concrete sits, is not glazed. I'd rather not take a hammer and chisel to it. I read where muriatic acid could work if the concrete was not more than 28 days old; however this is definitely old concrete. Help, please!

The photo is an example of the kind of pot involved.

JoeD 05-01-2012 07:28 AM

Noting will dissolve the concrete. Try drilling holes into it. Lots of holes and then you might be able to chip the concrete out.

SilverBee 05-02-2012 04:59 AM

Dissolving Old Concrete
Thanks for the answer, Joe--even though it wasn't what I'd hoped to hear. :(
It's the largest of the three pots with the concrete. The other two have been used the same way but seem to have a soft substance that will chip out fairly easily, so it's not a total loss.

nealtw 05-02-2012 06:50 AM

I agree with Joe, whittling at it with a small carbide drill should loosen it up

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