Enhancing the reactivity of aluminosilicate materials toward geopolymer synthesis

Geopolymers are alternative materials to portland cement, obtained by alkaline activation of aluminosilicates. They exhibit excellent properties and a wide range of potential applications in the field of civil engineering. Several natural aluminosilicates and industrial by-products can be used for g...

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Bibliographic Details
Published in:Journal of materials science 2018-04, Vol.53 (7), p.4709-4733
Main Authors: Tchadjie, L. N., Ekolu, S. O.
Format: Article
Language:English
Subjects:
Activation
Alkalies
Aluminosilicates
Aluminum silicates
Cements (Building materials)
Characterization and Evaluation of Materials
Chemical attack
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Materials Science
Organic chemistry
Polymer Sciences
Portland cements
Reactivity
Review
Solid Mechanics
Synthesis
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Summary:Geopolymers are alternative materials to portland cement, obtained by alkaline activation of aluminosilicates. They exhibit excellent properties and a wide range of potential applications in the field of civil engineering. Several natural aluminosilicates and industrial by-products can be used for geopolymer synthesis, but a lot of starting materials have the disadvantage of poor reactivity and low strength development. This paper presents a comprehensive review of the main methods used to alter the reactivity of aluminosilicate materials for geopolymer synthesis, as reported recently in the literature. The methods consist of mechanical, thermal, physical separation and chemical activation, of which mechanical activation is the most commonly employed technique. The reactivity of the activated aluminosilicate materials is mainly related to the activation method and the treatment parameters. Chemical activation by alkaline fusion is a promising method allowing preparation of one-part geopolymer materials, an alternative class of geopolymeric binders. However, the resulting alkaline-fused geopolymer products are vulnerable to attack by excessive alkalis.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-017-1907-7