Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Microstructural characteristics of belite–sulfoaluminate cement clinkers with bottom ash
Highlights Coal combustion bottom ash was used for synthesis of belite–sulfoaluminate clinkers. Clinker phases, microstructure and reactivity was studied at 1200, 1250 and 1300 °C. Various raw material derived impurities incorporated in main clinker phases. Ti stabilized β-belite and alkalis lowered optimal sintering temperature. Sintering at 1200 °C resulted in the most reactive and the easiest grindable clinker.
Abstract The incorporation mechanism of impurities derived from raw materials into a belite-sulfoaluminate cement clinker with bottom ash was investigated in two raw mixtures. Alkalis lowered the sintering temperature by 50 °C. Ti stabilized β belite and prevented the formation of γ-belite. Sodalite solid solution showed an incomplete substitution of Si by Al. At a higher Ti content ferrite solid solution trended towards perovskite composition. Although calcium sulfoaluminate only fully developted at 1300 °C, the clinkers sintered at 1200 °C were the most reactive, as the presence of anhydrite at 1200 °C accelerated early hydration. Clinker reactivity decreased with an increase in sintering temperature.
Microstructural characteristics of belite–sulfoaluminate cement clinkers with bottom ash
Highlights Coal combustion bottom ash was used for synthesis of belite–sulfoaluminate clinkers. Clinker phases, microstructure and reactivity was studied at 1200, 1250 and 1300 °C. Various raw material derived impurities incorporated in main clinker phases. Ti stabilized β-belite and alkalis lowered optimal sintering temperature. Sintering at 1200 °C resulted in the most reactive and the easiest grindable clinker.
Abstract The incorporation mechanism of impurities derived from raw materials into a belite-sulfoaluminate cement clinker with bottom ash was investigated in two raw mixtures. Alkalis lowered the sintering temperature by 50 °C. Ti stabilized β belite and prevented the formation of γ-belite. Sodalite solid solution showed an incomplete substitution of Si by Al. At a higher Ti content ferrite solid solution trended towards perovskite composition. Although calcium sulfoaluminate only fully developted at 1300 °C, the clinkers sintered at 1200 °C were the most reactive, as the presence of anhydrite at 1200 °C accelerated early hydration. Clinker reactivity decreased with an increase in sintering temperature.
Microstructural characteristics of belite–sulfoaluminate cement clinkers with bottom ash
Žibret, Lea (Autor:in) / Ipavec, Andrej (Autor:in) / Dolenec, Sabina (Autor:in)
29.12.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
BCSA clinker , Belite , Calcium sulfoaluminate , Secondary raw materials , Microstructure , Reactivity , OPC , Ordinary Portland cement , CSA , BCSA , Belite-sulfoaluminate , BYF , Belite–ye’elimite , SEM , Scanning electron microscopy , BSE , Back-scattered electron detector , EDS , Energy-dispersive X-ray spectroscopy , LOI , Loss on ignition , PSD , Particle size distribution
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