Alkali Activation of Aluminosilicate Materials
Summary
Alkali activation is a chemical process in which aluminosilicate sources such as clays, slags and industrial by-products react with alkaline solutions to form hardened, cement-like binders known as geopolymers or alkali-activated materials. This approach offers a sustainable alternative to conventional Portland cement by reducing carbon emissions, valorising waste streams and enhancing resistance to chemical and thermal degradation. Activation typically involves dissolution of silica and alumina species from a precursor under high pH, followed by polycondensation into an amorphous or semi-crystalline three-dimensional network. Key factors influencing reaction kinetics and final properties include the composition and particle size of the precursor, type and concentration of the activator, curing temperature and duration. Advances in this field have enabled tailored binder formulations for applications ranging from construction materials and waste encapsulation to high-performance composites and environmental remediation. Ongoing research seeks to expand the range of viable precursors, optimise activator chemistries and improve the understanding of microstructural evolution during curing. The global significance of these materials lies in their potential to decarbonise the built environment and to leverage locally available aluminosilicate resources.
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Alkali Activation of Aluminosilicate Materials publication trend
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Technical terms
Alkali activation: Chemical reaction in which aluminosilicate materials dissolve in alkaline solution and reassemble into hardened binders.
Aluminosilicate: A material composed of aluminium, silicon and oxygen, often present in clays, slags and other minerals.
Geopolymer: An amorphous or semi-crystalline inorganic polymer formed through alkali activation of aluminosilicate precursors.
Metakaolin: A dehydroxylated form of kaolin clay produced by thermal treatment, rich in reactive aluminosilicate phases.
Silicate modulus: The ratio of silicate to hydroxide in an activating solution, which governs dissolution and gel formation.
Efflorescence: The migration and crystallisation of soluble salts on the surface of alkali-activated materials.
References
- Metabentonite and metakaolin-based geopolymers/zeolites: relation between kind of clay, calcination temperature and concentration of alkaline activator. Journal of Thermal Analysis and Calorimetry (2023).
- Curing temperature’s effect on argillite-metakaolin based geopolymer grouts. Ceramics International (2024).
- Alkali Activation of Milled Red Brick Waste and Calcined Illite Clay with Silica Gel Addition. Materials (2022).
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