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Adding Old Lumps of Plaster to Concrete Mix?

Postby jbfenton » Mon Feb 01, 2016 11:52 pm


I would like to know if anybody knows whether using old plaster (knocked off the walls of my victorian built walls and ceilings) would adding this into a cement mixer with ballast and cement do any harm??

Is there another chemical reaction that would happen and weaken it or would it effectively be like adding a bit of sand?

Any help would be greatly appreciated, I have been trawling the forums and haven't seen anything related to this specifically. I found something about making fresh plaster and concrete mixes.

Thanks in advance,

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