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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/196119
Alkali-activated binders based on the coarse fraction of municipal solid waste incineration bottom ash
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The potential of the least polluted fraction (from 8 to 30mm) of municipal solid waste incineration (MSWI) weathered bottom ash (WBA) as an alkali-activated cement precursor was evaluated. Alkali-activated WBA binders (AA-WBA) formulations were prepared through alkali-activation of WBA as sole precursor. Sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) mixtures with different pH's were used as alkali-activator solution. The effect of alkali-activator solution pH on the final properties was assessed. Results showed the hydrolytic stability of allformulations. The selective chemical extractions and physicochemical characterisation revealed the formation of the C-S-H, C-A-S-H, and (N,C)-A-S-H gels. The promising compressive strength results demonstrated the potential of AA-WBA binders. The increase of pH in the alkali-activated solution promotes the formation of gel reaction products and enhance mechanical properties. This investigation promotes the green cements manufacturing and the use of secondary resources to reduce the impact of natural resources extraction used for the ordinary Portland cement (OPC) production.
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MALDONADO ALAMEDA, Alex, et al. Alkali-activated binders based on the coarse fraction of municipal solid waste incineration bottom ash. Boletin de la Sociedad Española de Ceramica y Vidrio. 2021. Vol. 61, num. 4, pags. 1-12. ISSN 0366-3175. [consulted: 17 of August of 2026]. Available at: https://hdl.handle.net/2445/196119