Rheology evolution of a geopolymer precursor aqueous suspension during aging

Geopolymer‐based glass‐ceramic matrix composites can be processed at room temperature and a heat treatment below 100°C leads to matrix hardening thanks to the geopolymerization mechanisms. The stabilization of the matrix into glass‐ceramics is achieved via a post‐curing at high temperature. This pav...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2020-07, Vol.17 (4), p.1802-1810
Main Authors: Dusserre, Gilles, Farrugia, Anaïs, Cutard, Thierry
Format: Article
Language:English
Subjects:
Aging
Aluminosilicates
Aluminum silicates
Ceramic matrix composites
composite
Dissolution
Engineering Sciences
Evolution
geopolymers
Glass
Heat treatment
High temperature
Liquid composite molding
Polymer matrix composites
Precursors
Rheological properties
Rheology
rheology/rheometry
Room temperature
Shear rate
Shearing
suspensions
thixotropy
Viscosity
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Summary:Geopolymer‐based glass‐ceramic matrix composites can be processed at room temperature and a heat treatment below 100°C leads to matrix hardening thanks to the geopolymerization mechanisms. The stabilization of the matrix into glass‐ceramics is achieved via a post‐curing at high temperature. This paves the way of the utilization of cost‐effective liquid composite molding processes, for which all the necessary equipment is already available for processing temperature ranges related to polymer matrix composites, provided that the rheological behavior of the precursor is suitable to conveniently permeate the fibrous preform. The paper describes the thixotropic rheological behavior of a reference suspension at processing temperature (10°C‐20°C) and its evolution along aging at −18°C. The changes are interpreted in terms of geopolymerization mechanisms (dissolution and polycondensation) and suspension rheology (predominance of hydrodynamic effects at high shear rate). On this basis, a phenomenological modeling framework, combining two Krieger‐Dougherty equations, is proposed to build a relationship between the effective viscosity of the suspension and the phenomena involved during aging (dissolution of aluminosilicate particles) and shearing (microstructure scalar variable).
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.13508