Preparation of the saving-energy sulphoaluminate cement using MSWI fly ash

MSWI fly ash was used as a major cement raw material in sintering sulphoaluminate cement clinker successfully in the laboratory. Sintering system, mechanical performance, hydration process and microstructure of the clinker was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence spectrometry (XRF), etc. The result shows that the clinker can be sintered properly under the temperature of 1200-1300 °C and sintered time of 120 min. Cl− content in the clinker made with MSWI fly ash is about 1.08%. However most Cl− cannot leach out in water solution from the hardened cement paste during curing age between 1 d and 28 d because of the Cl− being combined in clinker minerals and its hydrates. The compressive strength of the sulphoaluminate cement was high in early age while that developed smoothly in later age.