Hydration behaviour of sulphoaluminate belite cement in the presence op various calcium sulphates

Abstract The Sulphoaluminate belite cement clinker with the main phases C 2 S, C 4 A 3 S, C 4 AF, was synthesised from limestone, fly ash and gypsum. Its hydration was studied in the presence of different admixed calcium sulphates (anhydrites calcined at 750°C, 1200°C, hemidrate, gypsum) by differential calorimetry at room temperature. Results show that predominantly the solubility and to lesser extent the content of calcium sulphate influences the early period-of hydration process.