Comparison between Wet chemical Analysis and Rietveld Method Quantification in White Cement Samples

摘要

White Portland cement is composed of three basic oxides (CaO, Al2O3 and SiO2) and minor components such as Na2O, K2O, SO3, etc. The main and obvious difference with respect to grey cement is color, which represents a decisive criterion for evaluating the quality. The white cement clinker shows the interstitial phases composed almost only by C3A. The wet chemical analysis was applied in this study to compare the results from X-ray diffraction (XRD). The main oxides results were applied to some Bogue modified equations to correlate results with those from mineralogical quantification. Phases quantification was done using the XRD and Rietveld analysis using the X′Pert High Score Plus software from Panalytical. The comparison of results showed good correlation for the main phases of clinker and also calcite from limestone. This research shows the Rietveld Method as an important tool for qualification and quantification of cement.^