Characterization of geopolymers from compositionally and physically different Class F fly ashes
作者： Jae Eun Oh , Yubin Jun , Yeonung Jeong
DOI: 10.1016/J.CEMCONCOMP.2013.10.019
关键词:
摘要: Abstract The alkali-activation technology of coal fly ash is one several potential solutions to minimize the harmful disposal ash. This study reports high-resolution characterization alkali-activated reaction products for two representative Korean Class F ashes, which are significantly different in compositional and physical characteristics. analysis confirms that differences network modifying element content, amorphous phase particle size lead large compressive strength. Chabazite-Na Al-rich chabazite-Na identified as major crystalline phases high strength samples, supporting favoring formation ABC-6 family zeolitic precursors higher mechanical while C–S–H from CaO content (or CaO) not a source XRD shows presence humps located at 27–29° 2θ sufficient indicator geopolymeric gel formation. In 29Si MAS NMR, some portion −108 ppm Q4(0Al) peak related quartz, implying this Si atoms actively participate geopolymerization. 27Al NMR spectra exhibit more conversion Al(V) Al(VI) aluminum into Al(IV) units sample, can be an indication reaction.
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