Calcium sulfoaluminate cements are widely used as special cements and, because of their low specific carbon dioxide emissions relative to those of Portland cement, they have potential for use in general construction. However, their widespread application has been limited by the relatively high cost of aluminous raw materials. As part of a broad programme on the optimisation of these cements, the clinker mineralogy was reformulated to enhance the activity and strength contribution of the silicate...

A new method for producing calcium sulfoaluminate (C$A) clinkers is described. Sulfur is introduced from the gas phase as sulfur dioxide and oxygen and reacts with solids during clinkerisation. In this paper, the laboratory experiments are described and thermodynamic calculations are presented. The sulfur-containing phases ye'elimite and ternesite were stabilised together with belite to produce clinkers with various mineralogies. The influences of temperature and sulfur dioxide partial pressure were analysed and their effect on the...