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Home  > Raw materials & technologies  > Applications  > Alkali-activation of ferrum-rich syntheti...

Monday, 14 October 2019
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Raw materials & technologies, Applications

Alkali-activation of ferrum-rich synthetic slags

Friday, 4 October 2019

The formation mechanism of alkali-activated materials from two ferrum-rich synthetic slags has been assessed recently.

The pursuit of low-CO<custom name='sub'>2</custom> technologies has led to a surge in research on alternative cementitious materials of which alkali-activated materials are a large family. Source: apfelweile – stock.adobe.com.
The pursuit of low-CO2 technologies has led to a surge in research on alternative cementitious materials of which alkal...

In recent years alkali-activated materials have expanded to encompass Fe-rich precursors in addition to the more commonly employed aluminosilicate precursors. The formation mechanism of alkali-activated materials from two Fe-rich synthetic slags has been assessed by employing in-situ X-ray total scattering and subsequent pair distribution function analysis.

Three reaction stages

The evolution of the local atom-atom correlations reveals three reaction stages. After the dissolution of Fe-silicate clusters from the slag, a binder phase is formed with Fe in both Fe2+ and Fe3+ oxidation states. The Fe2+ state is present in the form of trioctahedral layers, similar to those in Fe(OH)2, while the Fe3+ is likely located in the polymerised silicate network. Exposure to air causes the Fe2+ species to transition to the Fe3+ state.

The study is published in: Cement and Concrete Research Volume 122, August 2019, Pages 179-188.

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