Alkaline Activation of Hybrid Cementitious Materials
Summary
Alkaline activation of hybrid cementitious materials encompasses the synthesis of binders in which traditional Portland cement clinker is partly replaced by industrial by-products such as fly ash, blast furnace slag or metakaolin, and the resulting blend is activated by alkali solutions. This approach merges the ambient-temperature reactivity of Portland cement with the geopolymerisation mechanisms of aluminosilicate precursors, yielding a composite binder whose microstructure comprises interpenetrating networks of calcium-silicate-hydrate and alkali-aluminosilicate-hydrate gels. By tailoring the alkalinity of the activating medium and the proportions of clinker and supplementary cementitious materials, one can accelerate early strength development, adjust workability and control long-term durability characteristics. The global significance of this technology lies in its potential to reduce carbon emissions from clinker production, to valorise industrial residues and to confer enhanced resistance to chemical and thermal attacks. Applications range from precast concrete units to repair mortars and infrastructure elements in aggressive environments. Ongoing research aims to elucidate the phase assemblage evolution, to optimise mix design for large-scale production and to align performance with existing standards for sustainable construction.
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Alkaline Activation of Hybrid Cementitious Materials publication trend
The graph below shows the total number of articles in alkaline activation of hybrid cementitious materials across all publications each year (not limited to Nature Index journals).
Technical terms
Alkali activator: A highly alkaline solution (commonly sodium hydroxide or sodium silicate) used to initiate dissolution and polymerisation of aluminosilicate precursors.
Hybrid cement: A binder in which a fraction of Portland cement clinker is replaced by supplementary materials and activated by alkalis to form combined hydration and geopolymer products.
Calcium-silicate-hydrate (C-A-S-H) gel: The primary binding phase in hydrating cement, enriched with aluminium when formed in hybrid systems.
Sodium-aluminosilicate-hydrate (N-A-S-H) gel: A geopolymeric binder gel derived from alkali activation of aluminosilicate materials such as fly ash.
Clinker factor: The proportion of traditional Portland cement clinker in a cementitious blend, often reduced in hybrid formulations to lower CO₂ emissions.
References
- Phase Evolution of Hybrid Alkali Sulfate-Activated Ground-Granulated Blast Furnace Slag Cements. ACS Sustainable Chemistry & Engineering (2023).
- Hydration of Hybrid Alkaline Cement Containing a Very Large Proportion of Fly Ash: A Descriptive Model. Materials (2016).
- Synthesis and Characterization of a Hybrid Cement Based on Fly Ash, Metakaolin and Portland Cement Clinker. Materials (2020).
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