I looked through the scientific literature for
calcium aluminates and I did not find any evidence
that monocalcium aluminate
will add water to become monocalcium
I'm not sure there is an answer to your question.
The only undecahydrate I found in this chemical
which is not the same compound you asked
Most calcium aluminate hydrates have
a hexagonal structure. The powder diffraction
patterns for any hexagonal structure will be very
similar with only, as you say, a slight difference
corresponding to differences in d spacings. If
changing the hydration of the compoundchanges the
overall crystal structure, then you will get an
entirelydifferent pattern, as in the case of
which has a
R.N.; Majumdar, A.J. "The Hydration of Monocalcium
Aluminateat Different Temperatures." Cement and
Concrete Research. 1988, 18,311-329.
T.R.; Christensen, A.N.; Hanson, J.C.
"Hydrothermal transformation of the calcium
aluminum oxide hydrates
to Ca3Al(OH)12 investigated
by in situ synchrotronX-ray powder diffraction."
Cement and Concrete Research, 2005, 35,2300-9.
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