Abstract:
Ordinary Portland-cement clinkers were characterised
using neutron and synchrotron powder diffraction.
Rietveld analysis was performed using individual as well
as combined data. Comparisons were made between phase
quantifications made using these different data sets, and with
published results from other methods. Neutron results showed
difficulty in distinguishing between tri- and dicalciurn silicate
phases, whilst synchrotron results compared well to other
methods. Refinements were performed with and without refinement
of the atomic positions of some atoms in the two
main phases of a sample, and the results compared. Less than
1% adjustment in the atomic positions was found to decrease
Bragg R-factors by about 20%.
