Quantitative phase analysis by means of X-ray powder diffraction performed using the Rietveld method (hereinafter QXPA) has been applied to a large number of industrial clinkers produced at different plants. The results have been compared with those obtained by calculation methods based on chemical analysis, such as the Bogue method. QXPA usually gives higher C3S and lower C2S values than those derived by Bogue. Regarding the composition of the aluminate phases, when only cubic C3A is present, QXPA values are lower than Bogue values; the opposite is observed when also C3A orthorhombic polymorph is found. In those samples having a high C3A content, the C4AF content is lower than the one calculated by Bogue. Differences between the mineralogical composition obtained by QXPA and by the calculation methods seem to be strongly dependent on the alkali and sulfate contents in the clinker. Moreover, a good correlation has been found between the sulfate module and the C3S/C2S and C3A/C4AF content ratios obtained by QXPA.
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