Synthesis And Scaled-Up Of Standard And Active Belite-Alite-Ye'Elimite Clinker (Bay)
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<strong>ABSTRACT:</strong> Clinkers with the coexistence of belite-alite-ye´elimite (BAY) are considered as eco-friendly cements due to the reduced CO<sub>2</sub> emissions released during their manufacture. All BAY clinkering parameters have been optimized: raw materials, mineralizers/activators, clinkering conditions and scaled-up methodology. Two types of clinkers were prepared and scaled-up to have ~2 kg: i) standard-BAY (28.4 wt% of b-belite, 41.5 wt% of alite and 17.4 wt% of ye'elimite) by adding CaF<sub>2</sub> and ZnO to the raw mixture; and ii) active-BAY (18.1 wt% of α'<sub>H</sub>-belite, 42.1 wt% of b-belite, 15.8(2) wt% of alite, and 7.7(2) wt% of ye'elimite) by using optimized amounts of CaF<sub>2</sub>, ZnO and B<sub>2</sub>O<sub>3</sub>. The microscopy[P1] study has revealed that primary particle size of belite is larger (~10 µm) in the active clinker than in the standard one (~5 µm). Moreover, ferrite and alite have incorporated most of the Zn and F in their structures in both clinkers, while belite (b and α’<sub>H</sub> forms) has preferentially incorporated sulphur.
