Quantitative in Situ X-ray Diffraction Analysis of Early Hydration of Belite-Calcium Sulfoaluminate Cement at Various Defined Temperatures

The influence of temperature on the early hydration belite-calcium sulfoaluminate cements with two different calcium sulfate to molar ratios was investigated. phase composition and assemblage development prepared using 1 2.5 were studied at 25, 40 60 °C by in situ X-ray powder diffraction. Rietveld refinement method used for quantification. degree after 24 h highest ambient temperatures, but significantly accelerated elevated temperatures. These differences more noticeable when we increased from 25 °C, than it °C. amount added controls precipitated ettringite, namely, ettringite cement a higher ratio. results showed that also affects full width half maximum peaks, which indicates decrease crystallite size temperatures due faster precipitation ettringite. When ratio 1, d-values peaks observed suggesting ions released clinker allowing ion uptake structure. At 2.5, less is available cement, therefore these not observed.