[parton-bill]

Hi all, newbie and first post so hi to all

Ok i am not a chemistry student, I am an engineering student currently working on my dissertation.

I have chosen to trial Bone Ash >>>   Ca(Ca3(PO4)2](OH)2  Morgulis (1936)

as a cement replacement, in which it is intended that the ashh will react with the silcate from aggregates and pozzolans, typical silicate pozzolan has been suggested by Cook (1986) to be H4SiO4

I know the reaction between normal cement and pozzalons is:

CaH2SiO4 • 2 H2O

and i expect a reaction between bone ash and the pozzolan to be something like:

Ca3H2Si(PO4)2 • 2 H2O   This is the part i would like to be checked please and if anyone can comment on the nature of the expected reactions that would be even more helpful.


the chemical aspect will be pivitol in my study and i therefore make an offer to any of you that may be interested.....If this topic interests you, and you could offer significant assitance with chemical modelling the i would be more than happy to give full credit for such in the final documents.

Many thanks for taking the time to read

[DevaDevil]

I would try to approach engineers/chemists in the field directly. It is not too hard to google scientific papers (if you do not have access to e.g. sciencedirect or ACS catcalogs), which will give you the contact info of the experts in the field. They would bu far be able to help you better on this subject.

My initial reaction/chemical intuition would be the following:
The cement process is a fairly straightforward acid-base reaction, between acidic silicate and alkaline calcium hydroxide, followed by a precipitation step. This does not involve transferring ligands from calcium to silicon, which would have to be the case if you want to make your assumed product (Ca₃H₂Si(PO₄)₂^.H₂O) from bone ash (the phosphate has to be transferred from Ca to Si).
Therefore I am sceptical that this would be the product of your reaction.