Non-Traditional Aluminous Binders: Correlation Between Properties and Composition

Resumo

The synthesis mechanisms and hydration processes of several super-refractory calcia baria aluminous cements and their behavior in concretes are discussed. The studies concern the complex hardening processes of C₂BA₄ , CA₂–C₂BA₄ , and CA₂–C₂BA₄–ss_CA–BA binding systems after heat treatment at different temperatures for 2 hrs. Chemical reactivity of the selected compositions and the nature of obtained hydrates were assessed. X-ray diffraction studies were performed to investigate the synthesis process and the degree of hydration of the mineral compounds. Concretes were prepared with 15 wt.% cement and 85 wt.% tabular alumina aggregate. Studies of the produced concretes showed that the investigated cements develop binder properties when the mineral compositions are adequately adjusted.