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Anyone here used this product? It has been a while since i looked at it, but my understanding from speaking with the producers is that cem-free is an additive/activator or whatever one might call it, which can be used in conjunction with GGBS as a 100% replacement for OPC in concrete. If not this then has anyone used a concrete mix with a large percentage of slag or I guess it could be done with ash?

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should I have added that this isn't an advert? I just wanted to find if anyone knew anything about either the product or the principle of Cement substitution.

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I wanted to use a percentage of furnace ash in the concrete for our slab and was told by the structural engineer that we couldn't because it would weaken the concrete too much.

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Sounds like a half way house to pozzolano concrete which is much less reliant on OPC but needs longer to cure. 

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If i've read correctly about PPC then it might be more accurate to say, that IT is a halfway house to cemfree. www.cemfree.co.uk - which doesn't seem to be working at the moment - is the website for it - part of the DAvid BAll group. If anyone can actually understand the technical bits then feel free to enlighten me

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