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Synthesis and characterization of new inorganic polymeric composites based on kaolin or white clay and on ground-granulated blast furnace slag

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Abstract

Alkali activation of dehydroxylated kaolin or clay yielded high-strength polymeric materials, so-called geopolymers. They were synthesized by mixing the aluminosilicate with solutions of sodium metasilicate and KOH followed by adding 45 wt.% of ground-granulated blast furnace slag. The influence of the aluminosilicate source, its activation temperature, and the order of mixing raw materials were studied on the workability of the blending paste, the microstructure, and the Vickers hardness of the geopolymer samples. The polymeric material is completely amorphous according to x-ray diffraction. Solid-state 27Al and 29Si magic-angle-spinning nuclear magnetic resonance showed that the geopolymer consists of AlO4 and SiO4 tetrahedra linked together through a polymeric network constituted by branched entities SiQ4(4Al) and SiQ4(3Al), but also by less-polymerized silicates SiQ1 and SiQ2. Scanning electron microscopy showed a homogeneous polymeric gel matrix containing unreacted slag (and quartz) grains; thermogravimetric analysis and differential scanning calorimetry exhibited a high content of water and an elevated melting point (1260°C). Vickers hardness values are in the range of 200 MPa.

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Authors and Affiliations

  1. LCIS, Department of Chemistry, Chemistry Institute B6, University of Liège, Sart-Tilman, Liège, B-4000, Belgium

    I. Lecomte, M. Liégeois, A. Rulmont & R. Cloots

  2. Construction Steel Design Center (ARCELOR INNOVATION), Boulevard de Colonster B57, Sart-Tilman, Liège, B-4000, Belgium

    F. Maseri

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  1. I. Lecomte
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  2. M. Liégeois
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  3. A. Rulmont
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  4. R. Cloots
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  5. F. Maseri
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Correspondence to I. Lecomte.

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Lecomte, I., Liégeois, M., Rulmont, A. et al. Synthesis and characterization of new inorganic polymeric composites based on kaolin or white clay and on ground-granulated blast furnace slag. Journal of Materials Research 18, 2571–2579 (2003). https://doi.org/10.1557/JMR.2003.0360

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  • DOI: https://doi.org/10.1557/JMR.2003.0360

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