In this work, the possibility of using titanogypsum (T) and water potabilization sludges (WPS) as a source of material in the production of belite calcium sulfoaluminate (BCSA) cements has been investigated. Four BCSA clinker-generating raw mixes were heated in a laboratory electric furnace in the temperatures range 1200°-1350°C: one included only natural materials (limestone, clay, bauxite and gypsum); the others contained T and/or WPS as total substitute for natural gypsum and clay, respectively. Quantitative X-ray diffraction analysis on the burning products showed high conversion of reactants toward the main BCSA hydraulically active clinker components (C2S and C4A3$), especially at 1300° or 1350°C. Moreover, isothermal calorimetric measurements associated with differential thermal-thermogravimetric analyses showed that all BCSA cements, obtained by adding commercial anhydrite to the clinkers produced at the optimum synthesis temperatures, generally displayed a similar hydration behaviour
Enhancement of the environmentally friendly features of belite-calcium sulfoaluminate cements through the use of industrial by-products
Antonio Telesca
;Milena Marroccoli;
2019-01-01
Abstract
In this work, the possibility of using titanogypsum (T) and water potabilization sludges (WPS) as a source of material in the production of belite calcium sulfoaluminate (BCSA) cements has been investigated. Four BCSA clinker-generating raw mixes were heated in a laboratory electric furnace in the temperatures range 1200°-1350°C: one included only natural materials (limestone, clay, bauxite and gypsum); the others contained T and/or WPS as total substitute for natural gypsum and clay, respectively. Quantitative X-ray diffraction analysis on the burning products showed high conversion of reactants toward the main BCSA hydraulically active clinker components (C2S and C4A3$), especially at 1300° or 1350°C. Moreover, isothermal calorimetric measurements associated with differential thermal-thermogravimetric analyses showed that all BCSA cements, obtained by adding commercial anhydrite to the clinkers produced at the optimum synthesis temperatures, generally displayed a similar hydration behaviourI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
