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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

Published online by Cambridge University Press:  31 January 2011

I. Lecomte ,
M. Liégeois ,
A. Rulmont ,
R. Cloots  and
F. Maseri
I. Lecomte*
Affiliation:
LCIS, Department of Chemistry, Chemistry Institute B6, University of Liège, Sart-Tilman B-4000 Liège, Belgium
M. Liégeois
Affiliation:
LCIS, Department of Chemistry, Chemistry Institute B6, University of Liège, Sart-Tilman B-4000 Liège, Belgium
A. Rulmont
Affiliation:
LCIS, Department of Chemistry, Chemistry Institute B6, University of Liège, Sart-Tilman B-4000 Liège, Belgium
R. Cloots
Affiliation:
LCIS, Department of Chemistry, Chemistry Institute B6, University of Liège, Sart-Tilman B-4000 Liège, Belgium
F. Maseri
Affiliation:
Construction Steel Design Center (ARCELOR INNOVATION), Boulevard de Colonster B57, Sart-Tilman B-4000 Liège, Belgium
*
a)Address all correspondence to this author. e-mail: I.Lecomte@ulg.ac.be
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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.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 11 , November 2003 , pp. 2571 - 2579
Copyright
Copyright © Materials Research Society 2003

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