Abstract
The surface of Grade III fly ash particles was modified by addition of gypsum and mineralizing agent (anhydrous calcium chloride) at 960 °C for 2 h. The mineral phase formation, structure and chemical compositions of the modified fly ash were analyzed by XRD, FESEM and EDS. Moreover, the influences of surface-modified fly ash on the compressive strength and freezing resistance of slag based geopolymer were also investigated in this work. The results showed that the β-2CaO·SiO2 (β-C2S) and 3CaO·SiO2 (C3S) phases were formed on the surface of fly ash particles after surface-modification. When adding modified fly ash into slag based geopolymer, due to the filling effect and functions of active agents (β-C2S and C3S), the strength and freezing resistance were improved markedly compared with that of the geopolymer added with original fly ash.
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