Use of fly ash and phosphogypsum for the synthesis of belite-sulfoaluminate clinker




Clinker, Microstructure, Fly ash, Gypsum, Calcium sulphoaluminate


Fly ash and phosphogypsum were used as Naturally Occurring Radioactive Materials (NORM) by-products for the synthesis of belite-sulfoaluminate clinkers. The influence of raw mixture composition and firing temperature was investigated. Clinkers and cements were examined by X-ray powder diffraction and scanning electron microscopy with energy dispersive X-ray spectroscopy. The compressive strength of the cements was determined after 28 days. Clinker phases identified included ye’elimite, ß-phase of belite, ternesite and gehlenite, while the main hydration product of the cement pastes was ettringite. The results showed that belite-sulfoaluminate cements can be fabricated with a compressive strength of 45.9 N/mm2 by firing the raw mixture (70 wt.% marl, 10 wt.% bauxite and 20 wt.% phosphogypsum) at a temperature of 1320°C/1h.


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How to Cite

Kramar, S., Žibret, L., Fidanchevska, E., Jovanov, V., Angjusheva, B., & Ducman, V. (2019). Use of fly ash and phosphogypsum for the synthesis of belite-sulfoaluminate clinker. Materiales De Construcción, 69(333), e176.



Research Articles