Abstract
Pure Al2O3–2SiO2 precursors (powders) for a geopolymer were prepared by a sol–gel method. The alkali-activated products derived from the precursors meet the general criteria for a geopolymer. The structure of the powders was investigated by NMR, XRD, and FTIR analysis, and their alkali-activation properties were studied. The data show that the powders when heat treated at 200 °C begin to contain 5-coordinated Al, those heat treated at 300 °C can begin to undergo alkali-activation, and those heat treated at 300–800 °C possess a number of structure characteristics similar to metakaolin, and the properties of their alkali-activated products are similar to those of the metakaolin geopolymers.
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Acknowledgements
The authors thank Professor Donald G. Barnes for critical reviews. This study was supported by the National Natural Science Foundation of China (50602006), and the Scientific Research Program of Guangxi Autonomous Region Educational Bureau (200626115).
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Zheng, G., Cui, X., Zhang, W. et al. Preparation of geopolymer precursors by sol–gel method and their characterization. J Mater Sci 44, 3991–3996 (2009). https://doi.org/10.1007/s10853-009-3549-x
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DOI: https://doi.org/10.1007/s10853-009-3549-x