Study on the activation of ternesite in CaO·Al2O3 and 12CaO·7Al2O3 blends with gypsum for the development of low-CO2 binders

This study aimed primarily to broaden the limited knowledge presently at hand about ternesite, 5CaO·2SiO2·SO3 (shorthand C5S2S¯,ter), reactivity in calcium sulfoaluminate-calcium aluminate (CSA-CAC) blended cements by exploring hydration of constituents simplified CaO·Al2O3 (CA) + (ter) CaSO4·2H2O (gypsum, gyp) or 12CaO·7Al2O3 (C12A7) (gyp) systems. According earlier research, a mineral constituent some eco-efficient sulfoaluminate cements, may be activated during Al(OH)3 other aluminates. The extent which such activation affected presence sulfate (gypsum) CSA is not currently known, however. present findings showed that ternesite both C12A7 and CA absence gypsum, although less intensely its presence. Calorimetric analysis revealed favours aluminates with water gypsum because surface serves as nucleation site where hydrates cluster just minutes after reaction begins. mineralogical characterisation pastes bearing was consistent thermodynamic modelling, predicted same products both, different stability ranges.