Anzeige
Erschienen in:
2020 | OriginalPaper | Buchkapitel
The Effect of Calcite and Gibbsite Impurities in Calcined Clay on Its Reactivity
verfasst von : Franco Zunino, Karen L. Scrivener
Erschienen in: Calcined Clays for Sustainable Concrete
Verlag: Springer Singapore
Aktivieren Sie unsere intelligente Suche, um passende Fachinhalte oder Patente zu finden.
Wählen Sie Textabschnitte aus um mit Künstlicher Intelligenz passenden Patente zu finden. powered by
Markieren Sie Textabschnitte, um KI-gestützt weitere passende Inhalte zu finden. powered by
Abstract
This study explored the effect of calcite (calcium carbonate) and gibbsite (aluminum hydroxide) impurities on the reactivity of a model calcined clay. Pure metakaolin was combined with calcite and gibbsite to prepare model raw clays, which were then calcined in a furnace at 800 °C for 1 h. The R3 test was used to assess reactivity of the calcined materials, and physical and mineralogical characterizations were performed. It was observed that calcite forms a layer of granular deposit over kaolinite particles, reducing its specific surface area. However, the impact on reactivity is relatively minor if the effect of dilution is accounted. In the case of gibbsite, it completely dehydrates upon calcination and transforms into inactive crystalline alumina. The effect of its presence was compared to quartz, and no significant differences were found. Thus, natural clays with calcite and gibbsite impurities are suitable for LC3 applications.