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• W2591525887 endingPage "1927" @default.
• W2591525887 startingPage "1919" @default.
• W2591525887 abstract "Geopolymers are inorganic aluminosilicates mainly proposed as environmentally friendly building materials, which are obtained by alkali activation of natural minerals, calcined clay (e.g., metakaolin) and other aluminosilicate sources. The wide range of chemical and mineralogical compositions of these raw materials influences several properties of the obtained geopolymers. In the present work, pure Al2O3·2SiO2 powders were synthesized via the sol–gel technique and proposed as pure aluminosilicate sources to prepare alkali activated geopolymers. Samples differing in the ratio between the SiO2 precursor and the H2O used in the sol–gel process were prepared, in order to study the effect of water content on the material structure and reactivity. The chemical structure of all the obtained Al2O3·2SiO2 powders were characterized by Fourier transform infrared (FT-IR) and solid-state nuclear magnetic resonance (27Al and 29Si MAS NMR) spectroscopies and compared to that of a reference metakaolin. Moreover, material reactivity was evaluated by alkali activation of the samples. After 28 days of ageing, 27Al and 29Si MAS NMR and FT-IR spectra ascertained the formation of a geopolymeric network in the activated samples. The results showed that lower water content allows obtaining a homogeneous Al-rich geopolymer similar to that obtained, using metakaolin as raw material." @default.
• W2591525887 created "2017-03-03" @default.
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• W2591525887 creator A5066954669 @default.
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• W2591525887 date "2017-02-21" @default.
• W2591525887 modified "2023-09-25" @default.
• W2591525887 title "Al₂ O₃ ·2SiO₂ powders synthesized via sol-gel as pure raw material in geopolymer preparation" @default.
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• W2591525887 doi "https://doi.org/10.1111/jace.14724" @default.
• W2591525887 hasPublicationYear "2017" @default.
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