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Document embargat fins el 2026-11-30

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2025-12-01

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cc-by-nc-nd (c) Marco-Gibert, J. et al., 2025
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/226011

Mechanically activated kaolin replacing metakaolin in alkali-activated cement formulation

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https://doi.org/10.1080/21650373.2025.2544315

Resum

This work provides in-depth research on alkali-activated binder formulations, employing mechanically activatedkaolin (K-MA) as a substitute precursor for metakaolin (MK). The potential of K-MA to replace MK was evaluated byconducting an extensive characterization of the alkali-activated cements (AACs). The structural analysis performedthrough Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA),27Aluminum magic angle spinning nuclear magnetic resonance (27Al MAS NMR), and scanning electron microscopy(SEM) revealed that K-MA enhances the amorphous nature and microstructural homogeneity of cements. The resultsdemonstrated that K-MA-based cements exhibit superior compressive strength than MK-based cements, especiallywhen sodium silicate (waterglass) was added, achieving values up to 42 MPa at 28 days. These findings suggest thatK-MA is a highly effective precursor for AACs formulation, as well as an alternative to replace MK. While thermalactivation (TA) processes for dehydroxylation are associated with significant CO2 emissions, mechanical activation(MA) offers a more sustainable alternative by utilizing electrical energy, which can be derived from less pollutingrenewable sources.

Matèries

Reducció del diòxid de carboni, Ciment pòrtland, Impacte ambiental, Minerals d'argila, Caolí

Matèries (anglès)

Carbon dioxide mitigation, Portland cement, Environmental impact, Clay minerals, Kaolin

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Articles publicats en revistes (Ciència dels Materials i Química Física)

Citació

MARCO-GIBERT, Josep, ALVAREZ-COSCOJUELA, Adrian, MAÑOSA BOVER, Jofre, FORMOSA MITJANS, Joan, CHIMENOS RIBERA, Josep ma.. Mechanically activated kaolin replacing metakaolin in alkali-activated cement formulation. _Journal Of Sustainable Cement-Based Materials_. 2025. Vol. 1-48. [consulta: 28 de gener de 2026]. ISSN: 2165-0373. [Disponible a: https://hdl.handle.net/2445/226011]

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