Rourkela slag is characterised by having MnO content upto 6.75 per cent. Studies abroad have shown adverse effects of MnO in slag on its hydraulicity. However, Rourkela slag is different from foreign slags in having higher Al2O3 and lower CaO/SiO2 besides having high MnO. clinker activation of synthesized cao-Al2O3-SiO2-MnO glasses corresponding to composition of Rourkela slags showed favourable effects of MnO under optimum conditions. However, quenching of synthetic glass composition does not simulate conditions of granulation. Therefore, commercial samples of high manganese slag were investigated. PBFS cements ware prepared by intergrinding slag, clinker and mineral gypsum and tested. Optimum proportions of slag and clinker were found to be 50:50 with 4 per cent of gypsum. PBFS cements were found to comply with the standard reguirements. High manganese slag is recommended for manufacture of PBFS cement.
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