Fired Hydraulic Binder Based on Fluidized Combustion Fly Ash

This study is focused on possibilities of utilization of fluidized combustion fly ash for manufacturing of fired hydraulic binders as one of the principal raw materials for production of binders close to traditional cements. As a basic raw material high-calcium limestone was used, which was subsequently mixed with fluidized combustion filter fly ash (FCFFA) and fluidized combustion bed fly ash (FCBFA). The selected value of the hydraulic module was 1.7. Total two two-component raw material mixture were prepared which were burnt in a laboratory furnace under conditions at temperature of 1200 °C and 1250 °C. The evaluation was done on the basis of mineralogical composition using X-Ray diffraction (XRD) analysis, determination of the chemical composition of clinker and achieved basic physical properties. The aim was to produce a binder which could be very similar to strongly hydraulic lime or to cements of lower strength classes.