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Alkali-activated binders (geopolymers)


Technology Description

Alkali-activated binders are produced by the reaction of an alumino-silicate (the precursor) with an alkali activator. They rely on materials similar to those used in blended cement to reduce the clinker to cement ratio.

Relevance for Net Zero

The CO2 saving is highly variable - ranging from 10% to as high as 97% - and depends on the materials and processes to produce the alkali activators. Therefore, while some mixes and methods could provide considerable savings, others have much more limited potential. Furthermore, raw material availability may limit likely application in some regions, and it may be more efficient to use the raw materials in blended cements than for alkali-activated binders.

Key Countries

United States, United Kingdom, Switzerland

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