Obtaining a sulfoaluminate belite cement by industrial waste

Abstract

Sulfoaluminate belite clinkers by burning raw at moderate temperatures near 1250 °C were synthesized. The used mixtures were made by calcium carbonate blended to two industrial wastes: low calcium fly ash and phosphogypsum. The clinkers were characterised by X-Ray Diffraction (XRD), Infrared Spectroscopy (FTIR) and free lime. The hydraulic behaviour of the obtained cements, by adequate clinkers with 7% of added gypsum, was followed by XRD, scaning electronic microscopy (SEM), FTIR and NMR.

Keywords

• sulfoaluminate belite clinkers
• fly ash
• phosphogypsum
• hydratation