| Title: | Production and characterization of lightweight aggregates from municipal solid waste incineration fly-ash through single- and double-step pelletization process |
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| Authors: | ID Ferraro, Alberto (Author)
ID Ducman, Vilma (Author)
ID Colangelo, Francesco (Author)
ID Korat, Lidija (Author)
ID Spasiano, Danilo (Author)
ID Farina, Ilenia (Author) |
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| Files: |  URL - Source URL, visit https://www.sciencedirect.com/science/article/pii/S0959652622048491?via%3Dihub
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| Language: | English |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: |  ZAG - Slovenian National Building and Civil Engineering Institute
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| Abstract: | The performance of a cold-bonding pelletization process was investigated for lightweight aggregates (LWAs) production from municipal solid waste incineration (MSWI) fly-ash (FA), by including multiple waste materials in the aggregate mixture. Before pelletization, FA was pre-treated by washing with water, which led to a reduction of chloride (66.79%) and sulphate (25.30%) content. This was further confirmed by XRF and XRD analyses, which showed a reduction of chloride elements and the content of chlorine crystalline phases. The pelletization process was carried out using both single- and double-step methods. For single-step pelletization, all the mixtures contained 80% FA, combined with various compositions of cement (5, 10, and 15%) and granulated blast furnace slag (GBFS) (5, 10, and 15%). For the double-step pelletization 30% of cement and 70% of marble sludge (MS) were added to each of the previous mixtures. The apparent density of all the aggregates varied between 1.60 and 1.87 g cm 3, suggesting their suitability to be classified as LWAs. Aggregates produced from double-step pelletization showed improved characteristics, with water absorption capacity and open porosity generally lower compared to the corresponding aggregates from the single-step pelletization. The best values of compressive (crushing) strength (almost 11 MPa) were observed for double-step pelletization aggregates with initial cement: GBFS mixture of 15%:5%. Results from leaching tests showed an overall significant release of chloride and sulphate. Nevertheless, leaching from double-step pelletization aggregates was reduced by 1.73- 4.02 times for chloride and 1.58-5.67 times for sulphate, further suggesting that better performances are achievable through the addition of an aggregate second layer. |
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| Keywords: | MSWI fly ash, lightweight aggregate, microtomography, open access |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Publication date: | 26.11.2022 |
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| Publisher: | Elsevier |
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| Year of publishing: | 2023 |
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| Number of pages: | str. 1-11 |
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| Numbering: | Vol. 383 |
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| PID: | 20.500.12556/DiRROS-16137  |
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| UDC: | 620.1/.2 |
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| ISSN on article: | 1879-1786 |
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| DOI: | 10.1016/j.jclepro.2022.135275 |
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| COBISS.SI-ID: | 133711363 |
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| Copyright: | © 2022 The Authors. Published by Elsevier Ltd. |
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| Note: | Nasl. z nasl. zaslona;
Opis vira z dne 13. 12. 2022;
Št. članka: 135275;
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| Publication date in DiRROS: | 03.05.2023 |
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| Views: | 721 |
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| Downloads: | 591 |
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