>C4A3S is the 'precursor' for
>ettringite formation and is added to Portland cement to produce shrink-
>compensated, fast-setting concrete.
Now that I have drawn the structure it looks interesting :-) 6-member
rings of corner connected AlO4 tetrahedra with Ca in the center, and the
rings connected to form large cavities containing the sulphate. Wulf Depmeier
et al. had it cubic, while the recent x-ray Rietveld work of Colin Kennard
et al has it othorhombic pseudo-cubic.
It would perhaps be interesting to do some neutron work on this material
to see if there is no hydration in all those cavities, n'est pas Colin ?
(Colin is actually here at ILL doing a neutron experiment at the moment :-)
Alan Hewat, ILL Grenoble, FRANCE <[EMAIL PROTECTED]> tel (33) 4.76.20.72.13
ftp://ftp.ill.fr/pub/dif fax (33) 4.76.48.39.06 http://www.ill.fr/dif/
