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Hydrolytic stability of sodium silicate gels in the presence of aluminum

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Abstract

Polycondensation in alkali silicate solutions comprises a fundamental process of the geopolymerization technology. Previous works had shown that the hydrolytic stability of sodium silicate gels depends on the SiO2/Na2O ratio. Sodium silicate gels totally insoluble in water can be produced at SiO2/Na2O molar ratios higher than 4.4. This article aims at elucidating the effect of tetra-coordinated aluminum addition on the hydrolytic stability of sodium silicate gels. According to the results, the aluminum addition stabilizes the sodium silicate gels in an aqueous environment. A sodium silicate gel with SiO2/Na2O molar ratio 3.48, which is totally soluble in deionized water at ambient temperature, can be transformed to insoluble sodium hydroaluminosilicates with the addition of tetrahedral aluminum at Al/Si molar ratios higher than 0.08. In addition, this article studies the structure of prepared sodium hydroaluminosilicates and draws very useful conclusions for the geopolymerization technology.

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Acknowledgement

The authors would like to thank the Senator Committee of Basic Research of the National Technical University of Athens, Programme “PEBE-2007”, R.C. No.:65/1634 for the financial support of this study.

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Authors and Affiliations

  1. Laboratory of Metallurgy, School of Mining and Metallurgical Engineering, National Technical University of Athens, 15780, Zografou, Athens, Greece

    I. Giannopoulou & D. Panias

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  1. I. Giannopoulou
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  2. D. Panias
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Correspondence to D. Panias.

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Giannopoulou, I., Panias, D. Hydrolytic stability of sodium silicate gels in the presence of aluminum. J Mater Sci 45, 5370–5377 (2010). https://doi.org/10.1007/s10853-010-4586-1

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