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Title: Alkali-activated binders using bottom ash from waste-to-energy plants and aluminium recycling waste
Author: Maldonado Alameda, Alex
Mañosa Bover, Jofre
Giró Paloma, Jessica
Formosa Mitjans, Joan
Chimenos Ribera, Josep Ma.
Keywords: Recuperació de residus
Materials de construcció
Recovery of waste products
Building materials
Issue Date: 23-Apr-2021
Publisher: MDPI
Abstract: Alkali-activated binders (AABs) stand out as a promising alternative to replace ordinary Portland cement (OPC) due to the possibility of using by-products and wastes in their manufacturing. This paper assessed the potential of weathered bottom ash (WBA) from waste-to-energy plants and PAVAL® (PV), a secondary aluminium recycling process by-product, as precursors of AABs. WBA and PV were mixed at weight ratios of 98/2, 95/5, and 90/10. A mixture of waterglass (WG) and NaOH at different concentrations (4 and 6 M) was used as the alkaline activator solution. The effects of increasing NaOH concentration and PV content were evaluated. Alkali-activated WBA/PV (AA-WBA/PV) binders were obtained. Selective chemical extractions and physicochemical characterization revealed the formation of C-S-H, C-A-S-H, and (N,C)-A-S-H gels. Increasing the NaOH concentration and PV content increased porosity and reduced compressive strength (25.63 to 12.07 MPa). The leaching potential of As and Sb from AA-WBA/PV exceeded the threshold for acceptance in landfills for non-hazardous waste.
Note: Reproducció del document publicat a:
It is part of: Applied Sciences, 2021, vol. 11, num. 9, p. 1-15
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ISSN: 2076-3417
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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