Evaluating the possibility of using CFBC fly ash and WL for preparing geopolymer brick

Abstract

Large amounts of CFBC fly ash are discharged from coal-power plant in Korea. And waste limestones(WL) are also dischaged. But these wastes are improperly managed and bring out the secodary contamination. Therefore, it is needed urgently to treat them safely. We studid the method to use them as geopolymer brick. In this study, we adopted CFBC fly ash and WL as raw materials. And also akali activator is used to leach and react Si and Al ions from them. Mixing ratio of CaO/SiO2, reacting temperature, L/S ratio and so on, are used as affecting factors. Compressive strength was over 30 MPa at 4.73 of CaO/SiO2. Acording to rhe results, CFBC fly ash can be used as raw material for preparing geopolymer brick. But It is needed to discuss alternative material and the preparation condition to enhance the recycling quality of them.