Abstract
This study aims to improve the compressive strength of alkali-activated fluidized bed combustion (FBC) fly ash by incorporating silica fume and Al(OH)3. Interground silica fume–Al(OH)3–FBC fly ash powder was activated with sodium silicate and 15 M sodium hydroxide solutions curing at 65 °C for 24 h. Morphology and mineralogy of composites were studied using scanning electron microscope, X-ray diffraction and Fourier transform infrared spectroscopic analyses. Thermal stability of composites was also evaluated using thermogravimetry analysis. The results showed that homogeneous, dense and strong matrix could be obtained with addition of Al(OH)3 and silica fume to FBC fly ash. Additional alumino-silicate, calcium-silicate compounds and some zeolite were formed as a result of geopolymerization and hydration reaction of the composites. Si–O vibration mode of composites shifted to lower wavenumber suggesting the chemical bonding change to form a new molecule in composite.
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