DIY Doctor UK DIY Forums

Hello,

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,

Josh