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Recycling of Different Incineration Ashes in the Construction Sector: Perspectives from Slovenia

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  • Vesna Zalar Serjun

    (Slovenian National Building and Civil Engineering Institute, Dimičeva ulica 12, SI 1000 Ljubljana, Slovenia)

Abstract

The EU prioritizes transitioning to a circular economy, aiming to boost sustainable resource management through policies promoting recycling and reuse, benefiting both the environment and the economy. Many successful case studies demonstrate using various incineration waste by-products (ashes) as substitutes for natural materials, yielding environmental advantages and showcasing sustainable resource management practices. While extensive literature covers ash characterization and applications, the direct links between the properties of the main components, the amorphous phase, and research findings remain elusive. Analysis predominantly centers on microstructural phase development, influencing mechanical, physical, and chemical properties and guiding research interpretations. Existing standards for ash use primarily address coal-derived fly ash, with SIST EN 13282-2 allowing alternative sources like circulating fluidized bed and paper sludge incineration residues. Yet, beyond this standard, no regulations mandate using different ash types. Nonetheless, the applicability of ashes for the geotechnical composite materials has already been confirmed in the field since numerous geotechnical projects have been carried out in Slovenia. Such composites have been recognized as beneficial practices, and the majority of them also possess legal permission for usage according to the Slovenian Technical Approvals. Given the varying value and complexity of ashes, detailed characterization before use is crucial. Assessing the recycling potential of different ashes requires a precise definition of basic properties such as microstructure, minerals, and chemical composition. Emphasis should be placed on characterizing the hydraulic properties and gaining detailed insights into the amorphous phase, ensuring informed decision-making regarding their recycling processes.

Suggested Citation

  • Vesna Zalar Serjun, 2024. "Recycling of Different Incineration Ashes in the Construction Sector: Perspectives from Slovenia," Sustainability, MDPI, vol. 16(12), pages 1-10, June.
  • Handle: RePEc:gam:jsusta:v:16:y:2024:i:12:p:5065-:d:1414794
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    Cited by:

    1. Yu Duan & Željko Stević & Boris Novarlić & Sarfaraz Hashemkhani Zolfani & Ömer Faruk Görçün & Marko Subotić, 2025. "Application of the Fuzzy MCDM Model for the Selection of a Multifunctional Machine for Sustainable Waste Management," Sustainability, MDPI, vol. 17(6), pages 1-28, March.

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